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This is expected and has been this way for as long as I can think. Only AE 12.2 changed the behavior of mattes in collapsed comps. You will simply have to structure your comps differently and add one more level of nesting (without CR) for such matting stuff....
thank you for the quick response.
do you have any technical explanation for this?
most of the stuff of collapsed behavior I can understand
but this one eludes me.
I have been reading and learning from your posts for years
for problems I looked for in "creativecow" and other platforms.
its nice to get a direct answer this time
I read it somewhere, but I really can't remember where exactly. It's probbaly buried in one of Mr. Kopriva's lists on teh AE blog.
yes thought about looking there in the 12.2 update and fixes
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?