Collapse Transformation on my Precomp reveals a trackmatted layer although it shouldn't

Hi
I'm using adobe after effects CC 12.0 on a windows machine.
I've checked and I'm having this problem also on after effects cs6 11.0 (different machine)
this problem does not occur on after effects CC 12.2
my problem is that I have a composition with a precomp that contains a layer using
a Track Matte solid with a mask that is revealed from top to bottom.
when I move the precomp forward in time in my main composition and press Collapse Transformations
for the precomp, the layer that is supposed to be masked first and then revealed from top to bottom
reveals itself although it shouldn't just yet, as if I am looking forward in time in my precomp.
this happens only when I use a track matte instead of masking the layer itself.
and if I take the Precomp and move it to the start of my composition
it works just fine even when collapsed. but only after I purge all memory.
if I move if forward in time again it works fine but if I uncollapse and collapse again
and clean the cache - it causes the same problem.
my question is:
is this a bug? or am I missing something here?
since this is hard to explain
Im attaching a project file with similar situation to make it clear
http://f1.creativecow.net/6948/6948
and also attaching 5 jpegs to further illustrate the problem.

yes thought about looking there in the 12.2 update and fixes
http://blogs.adobe.com/aftereffects/2013/12/after-effects-cc-12-2-december-2013-update.htm l
but its not there. maybe its under "Fixed several other causes of crashes and errors"
(if it is an error or bug and not a behavior thats what I tried to understand)
maybe Todd is here?
thanks again.

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I read the help, it states that Collapse Transormation buttons treats the PreComp as seprated layers, which preserved 3D treatiment for casting shadows and does not cut off shapes by PreComp size.
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http://Noel.ProDigitalSoftware.com/temp/TransparencyTest/TransparencyTest2.html
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TR, I tried pre-composing and the Collapse Transformations switch was available to me afterwards, however the resulting pre-comp of my layers was still at 100%
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When you have pre-comped 3D objects in a Main 3D Comp, they will exist on a 2D plane within your Main Comp.
If you activate the Collapse Transformations (continuous rasterization) checkbox for the Pre-comp layer, the pre-comped 3D objects now exist individually within the Main Comp's 3D space, responding to the Main Comp's camera view etc. If the camera in your Main Comp is positioned differently to the camera in your Pre-comp, the objects may end up in different positions, maybe not in view at all.
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i Collapsing transformations exposes the 3D properties of the layers that compose the precomposition. Essentially, collapsing transformations in this case allows each 3D layer to be composited into the main composition individually, rather than creating a single 2D composite for the precomposition layer and compositing that into the main composition. The tradeoff is that this setting removes your ability to specify certain layer settings for the precomposition as a wholesuch as blending mode, quality, and motion blur.
http://livedocs.adobe.com/en_US/AfterEffects/8.0/WS3878526689cb91655866c1103906c6dea-7e3b. html

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The quickest way to do this is to pre-compose the layer.

AE CC 2014 - Using a Mask on a Collapsed Precomp destroy's it's properties??

Hey all I am having a ridiculous problem.
I have a normal precomp with a layer that has a multiply blending mode.
Normally i would collapse the precomp in its parent comp, and the Multiply Blending mode would be preserved (which it is).
The problem comes when I apply a simple Mask to the precomp, or use another layer as an alpha mask.
I loose my collapsed properties on the precomp....
Anyone know why this might happen? I'm using AE CC 2014, I FEEL like I've done this maneuver a million times before, is there something new and different about CC 2014 that I didn't catch? possibly I'm just forgetting something simple.
here is what's going on in my comp:

Try this. Add an expression control slider to the layer with the following expression:
wiggle(5, 50)
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[w, w]
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So I have an Adjustment layer with a mask and I've adjusted it's position/scale/rotation with the transform settings and I want to copy the mask to another layer and of course when I do this the mask goes to the shape it was before the transform settings were applied, if I copy both the mask and the transform settings the transform settings mess up the layer they are copied onto and while I know there are longer ways around this I wanted to know if there was a way to simply collapse the current transform settings into a mask so that the mask would stay as it is with the transform settings reset.

Masks are based on layer size not scale so the behavior you describe is expected.
There a couple of things you can do.
First, I'd modify the workflow and instead of scaling your adjustment layer with it's mask I'd animate the mask path or adjust the mask path. If that's not practical you can duplicate the adjustment layer, remove the effects, turn off the Adjustment Layer switch, then use the copy as a track matte for your other layer.
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Hello,
i've noticed an oddity after placing a couple layers in a precomp in that it looks "blurred" and has "jagged" edges on the main comp, but if i open the precomp it looks ok, the same problem happens after i render the output.
The precomped layer is simply two non-transparent 24 bpp PNGs (some rendered text on a black background) that have some transforms applied to the position and rotation, no other effect is present.
When i see it in the main comp one of the blocks shows white jaggies around it (the transform drops one of the blocks and rotates it like a falling billboard), and if i compare the comp windows to the precomp, it's clearly blurred.
i've googled and saw something about collapse transformations, i set it in the main comp for the precomped layer to no avail.
i also tried with color-keying the black BG in the precomp, the result is that in the main comp the image expanded to the left and had some ugly artifacts inside the letters.
these are cropped parts of the workarea, first the comp view with the distortion jaggedness and after that the precomp window(it's hard to see you might need to zoom in):, even then it's clear that the comp is blurred
i've turned off all preview tricks, working at full resolution, no avail...
i used this same precomp on another project (from which i imported it) which uses the same resolution and framerate and i wasn't seeing that issue there

i've checked both layers in the precomp and they're set to high quality, same as the precomp aulity in the comp itself, also disabled opengl completely in preferences and the jaggedness remains.
About the PAR of the png files, haven't checked, they're a random convenient size each one(quite big, 4.18mpx~).
just animating the layer transform setiings in the precomp, here's the captures, comp and precomp:
the single frame render output of this same frame:

Collapse Transformation on my Precomp reveals a trackmatted layer although it shouldn't

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