My labels disappear when going between the nether and the overworld. It is possible that this could be caused by another mod since this is on a modpack I have made. If needed I can post the list of mods being used. When showing hitboxes, the hitboxes do not appear. Using the mod Jade does not give a tooltip that they are there either.

My client version is 1.19.2 and the mod version is 1.9.

Previous reports showed that this was caused by optifine

Optifine may cause the same symptoms, but it isn't the only cause. It isn't present in my pack and the labels reliably fail to reappear when they are culled by draw distance. Might be time for a mod binary search to find the culprits.

There must be something else then as I wasn't able to replicate this

Not using optifine, all the performance mods that would be affecting this are the same as the ones present in this modpack for 1.19.2 that I used as a base. Hope this helps narrow things down.

Found a way to reliably reproduce on

Create a superflat world and plonk down labels on some blocks
TP yourself 1K blocks away and back

/tp @s ~ ~ ~1000
/tp @s ~ ~ ~-1000

Labels are gone

Should be fixed

This is happing on 1.20.1 fabric while using sodium

I'm seriously considering taking the mod off fabric. This issue is so arcane its ufixable and only happens on fabric