I don't see anything in TIFF handler code which could explain this so this
would definitely need to be debugged to understand what's going on. If you
can do it, please try to see what happens with these last 2Kb of data, e.g.
whether they're passed to wxTIFFWriteProc() and what does it do with them.
If not but if you can make a reproducible test case for this bug please
open a Trac ticket for it.
TT-Solutions: wxWidgets consultancy and technical support
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