Dear Maintainer, updating from libboost-regex1.74.0-14 to libboost-regex1.74.0-16 ask to remove aegisub. Thanks and best regards.
This is fixed with aegisub 3.2.2+dfsg-6.3 Thanks and best regards.
The original reporter says that the bug has been fixed with aegisub 3.2.2+dfsg-6.3, thus I'm closing the bug.