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

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roei tzorefCollapse Transformation on my Precomp reveals a trackmatted layer although it shouldn't
by on Jan 2, 2014 at 7:19:42 pm
Last Edited By roei tzoref on Jan 2, 2014 at 11:28:45 pm

I'm using adobe after effects CC 12.0 on a windows machine.

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 and
also attaching 5 jpegs to further illustrate the problem.

checked with another computer after effects cs6 11.0
and the problem is the same
but with after effects cc 12.2 it works fine without this problem.

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