Why does Startup Disk-ing to a 10.6.8 partition prevent my new 10.10 partition from booting?

An iMac of mine supports 10.10.  So, on a 3 terabyte drive partitioned into three partitions of 1 terabyte each (10.9.5, 10.6.8, Blank) I install 10.10 into the Blank partition.  This 10.10 boots, and I use its Migration Assistant to "pull forward" stuff from my 10.6.8 partition (quite a lot actually, about 400 GB; this takes many hours).  I then use 10.10's Startup Disk to boot back into 10.6.8.  From this point forward, the 10.10 partition will not boot 10.10.  The 10.10 files are there, but only 10.6.8 and 10.9.5 will boot from that volume.
I've tried this without the Migration and it's the same:  it appears that rebooting from 10.10 to 10.6.8 "spoils" the bootability of the 10.10 partition.  Is it because they are on the same volume?  No:  I've even tried it across multiple terabyte drives (each partitioned into 1 terabyte).
Huh?  This is a show-stopper for Yosemite (10.10) as if its bootability is this fragile given an older OS X version simply booting, I won't use it until this is fixed.

I am having the same problem. As a quick fix I've been using a bootable 10.8 thumb drive to boot to from 10.6.8 and then from there I boot off of my internal 10.10.2. It's absolutely ridiculous so I started searching for a more permanent fix and stumbled on your post. I'm still looking and hopefully there is some minor update soon which will allow 10.6.8 to see the 10.10 volume as bootable. Until then... the thumb drive stays with my computer.

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