To test - download this sqx archive with files from TC 9.5b2: https://madsenworld.dk/tcmd/tc950b2.sqx and try an go into the Language folder - only the *.inc files are shown - do the same with TC 9.5b11 - all language files are shown.
Probably has to do with one of these changes:
or maybe this:08.01.20 Added: Further improved speed of switching between directories within a large archive (32/64)
31.12.19 Added: Faster loading of large archives, and faster switching between directories within that archive (32/64)
Tested with TotalSQX plugin version 2.11 - https://totalcmd.net/plugring/totalsqx.html on Windows 708.01.20 Fixed: Going back to a different directory within an archive via history was re-reading the entire archive (32/64)