Your mod doesn't support version 1.21.9 (it crashes when launching a mod for 1.21.6-1.21.8)

Please support this version!
(Perhaps you're already working on it but have found issues related to entity render changes)

yes i am working on it right now, for those unaware 1.21.9 had a significant change to entity rendering and will take time,

this did not affect mods like sodium and iris as they made an incredible effort to update to every snapshot along the way

Take your time!
Also, what did they change on entity rendering? Just curious about it

they moved away from immedeate rendering to instead queueing renders to happen in later more performant (and in future seperately threaded) passes. as long as your mod doesn't rely on external data being modified / synced during render time it will be mostly unaffected, unfortunately etf and emf do use a bit of that but i've already prepared for removing most of that to support the new system