Regarding other ticket the issue is apparently different but the parity issue still exists, perhaps make it related to that
Can confirm Java missing the side illumination
Looks to be a parity issue tracked at MCPE-129050
Can confirm in 26.2, using repro steps from @fd52 causes the issue to consistently occur.
This issue is being tracked at MC-310319, though it still may be useful to leave a comment on that ticket describing the issue with cave spiders.
This report is invalid as this tracker only accepts reports for the latest unmodified versions of the game.
This issue is invalid as this tracker only supports reports for the latest version and snapshot.
This report is invalid as this tracker only accepts reports for the latest unmodified versions of the game.
Potentially relates to MC-249647, a comment on that report links to an incorrectly duplicated ticket as it describes a completely different issue
Your issue sounds very similar to the video attached in MC-306948. Does that describe your issue?
This report is invalid as this tracker only accepts reports for the latest unmodified versions of the game.
In a modified 1.21.8 client*
I only noticed the different issues after testing both, but either this ticket can be linked to that or that ticket’s description can be edited to include this