Small reproducer:
$ echo -e '<translate>\ntext1</translate><translate>\ntext2</translate>' |php bin/parse.php --wt2wt <translate> text1<translate> text2</translate> </translate>
We'd expect
<translate> text1</translate><translate> text2</translate>
as a result of this parsing.
In particular in the context of the <translate> annotation, nesting annotations is not allowed; trying to save this page after modification would (depending on the edit) display error messages.
This issue can also be shown by the following example:
$ echo "a ''<translate>b'' c ''d </translate> e <translate>f</translate>'' g" |/usr/bin/php /home/isa-wmf/gitrepo/parsoid/bin/parse.php --wt2wt a <translate>''b'' c ''d e <translate>f</translate>''</translate> g
which may be useful for a reproducer that doesn't get confusing around paragraph limits.