Doesn't work properly in v1.21.3

[RON777777]

What happened?

1.The particle effect when breaking a block becomes invisible
2.The PlayerHead becomes invisible
This is the issue I found, and there may be more unknowns

Minecraft Version

Other

Which shader mod are you using?

Iris

Shader mod version

1.0a

Shader settings

#Sat Nov 09 18:50:13 CST 2024
HANDHELD_LIGHTING=true

Relevant log output

No response

[ZenyaIse]

3. No block breaking animations.

[KateWil]

This seem to happen atleast in Iris 1.8 Beta 8 for 1.21.3 & 1.21.2 only. The shader version affected include 1.0a all the way to the lastest dev version.
All particle (potion effects, block breaking particles) seem to be extremely transparent, nearly invisible. The rain drop particles shown in the OP are also invisible (trasparent).
Other shaders (atleast including Complementary, BSL) do not have this problem.

[Adolfopgv]

Same here, isn't there anyway to fix ourselves for now in any config file?

[Tors-0]

can also confirm this issue on 1.21.3 with iris 1.8 beta.8