I'm not sure what causes this, but it only started after I updated the mod to this version.

It appears that you have multiple possible unrelated mods installed. Try reproducing the issue with only Jade and ImmediatelyFast installed. If it still happens, upload the game log

You can also post your findings here, as its most likely still an ImmediatelyFast issue because it worked before the update to 1.6.3

Would seem you are absolutely correct and an unknown third party is making these two mods clash somehow. I'll have to narrow down which ones doing it and post it on their github instead.

I'm having the same problem on my instance.
With version 1.6.2, Minecraft Neo-forge 1.21.1, Jade is displayed.
But with the latest update, 1.6.3, Jade no longer works properly.

I'm on neo forge 21.1.140.

I can't fix this issue as it stands currently, because Jade works fine on NeoForge for me. I need extra details, like which other mod is needed for it to break

I'm working on more details on this.
So far I've been able to sort of re-produce the issue (with my test Most of jade information is not displayed) with at least a more narrow mod list.

With ImmediatelyFast 1.6.2:

With ImmediatelyFast 1.6.3:

Neoforge: 21.1.141

Mods:
Jade: 15.10.0
Moonlight Lib: 1.21-2.17.37
Supplementaries: 1.21-3.0.43-beta
ImmediatelyFast: 1.6.3+1.21.1

If I remove Supplementaries/Moonlight, then Jade and ImmediatelyFast work.
If I leave Supplementaries/Moonlight, and downgrade ImmediatelyFast to 1.6.2+1.21.1, Jade works properly.

Pastebin of client starting and loading the world:
https://pastebin.com/9EyVNdgb

@Gerflargle Thank you. I could finally reproduce the issue. Working on a fix now

Also someone please confirm as well if its fixed on their end. I am going to release this version then

This version should have the issue fixed: https://github.com/RaphiMC/ImmediatelyFast/actions/runs/14160106195

I am happy to confirm, the test build you liked works in my test scenario (above), as well as a custom pack I am playing with.
No issues with Multiplayer that I was able to notice.

Thank you for your work on this.

Released the version as 1.6.4 on Modrinth and CurseForge