Why does the Illustrator "trap" command trap the same spot colors in opposite ways?

I can not understand how Illustrator decides which way to expand something when using the "trap" command. According to their tutorial it expands the lighter-colored artwork over the darker artwork, unless you choose to reverse traps. But in practise, where two objects of the same color meet, it will frequenrly trap them in one direction in one place and the opposite direction in the other.
Here's an example with especially large traps:
The two yellow items are defined as the same spot color and are a single compound path. There is just the one simple shape of spot red and one simple shape of spot pink.
On the left yellow object, it expands yellow over pink. On the right, it expands pink over yellow. On the left yellow object, it expands red over yellow. On the right, it expands yellow over red.
There is no possible print order of these three spot colors that would result in the correct object shapes being printed the way this is trapped. Is this just a bug? Can anyone explain this result, or especially how to make it work in a useable way?
All objects are spot colors that are cut out from each other so there were no overlaps.

Here's what it looks like with overprint preview:
It still looks wrong.
This view is glossing over how bad it would really look with screen printing, because the inks are much higher opacity than they're previewing here. I suppose that's what you're getting at, that the trapping may be bad for screen printing, but if you're assuming offset press inks that have next to no opacity and will mix together on press, that it doesn't matter which way you trap. Overprint preview makes yellow overprinting pink look the same as pink overprinting yellow. With spot colors in screen printing, that is no where near the case.
But even consdiering that, this trapping is wrong, the final shapes of the objects are changed by the trapping. And the trapping does not appear to follow Adobe's own description of the logic used, or any kind of consistency. Why would it expand yellow into pink in some places and pink into yellow in others?
I've heard the trapping in Indesign is much better, some screen printers open in Indesign to add trapping... maybe I'll look at that.

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