Worked, thanks.

You can update the Fabric loader version in the json file in the version folder.

I don't think the java server thing is related to Aristois. I am able to run the mod with 21. You can try changing it in the installation settings though.

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It's probably due to Iris then. Have you tried without these mods?

Unfortunately I don't know what the cause of this issue is

Got it, thanks for the answer!

Good to know.

No. This is not possible

Ok, found the mod, Just Enough Items is guilty

Remove all texture packs including programmer art (through vanilla game)

No, the new version has large render changes that require fixing. There is no ETA on 1.21.5 and I would not expect to see it in the near future if at all

its still an issue, it doesnt work with shaders and idk why.

oh thx, would be great to state this somewhere.

Thanks for the insanely fast support!

You have to run the Forge installer from their website and run that profile.

If the forge box is not there then that version is not supported.