Type's layout bounds are a cache that isn't saved. On open they were
computed again only for type in the layers, so type in a symbol definition
(or a pattern tile, graph design or opacity mask) kept the rough estimate,
and an envelope warping it was fitted to a different box: warped type in a
symbol changed shape after a save and reopen. The refresh now goes through
every art tree, masks included.
Gert Pellin
e54fe9c31e