Commit 92d421c wasn't backported to 1.21.1, cause a particle rendering issue.
https://github.com/IrisShaders/Iris/commit/92d421cae256289fa260a567e0ff82eb9c93bbf2
https://github.com/IrisShaders/Iris/issues/2813
GitHub
Mac Silicon Particles Blurry · Issue #2813 · IrisShaders/Iris
What happened? Under certain conditions, particles display extremely blurry / with incorrect resolution. I ran minecraft with only Iris, Sodium, and Complementary shaders on mac m4 silicon. I joine...
3 Replies
1.21 is abandoned in favor of players using 1.21.1 as the latter contains critical hotfixes.
typo
Hmm, no idea if 1.21.1 still under supported versions, but all I can think of is IMS probably won't be updating it anytime soon.
Or ever, for that matter. Most of the focus now comes to improving Aperture alongside keeping Iris working for latest version of Minecraft until Vibrant Visuals drop.