Describe the bug
Both "Show Entire Selection Outline" and "Selection Outline Color" appears to be broken on Minecraft 1.21.
The default outline is also barely visible. The only color that seems to do something is the Negative that shows a thin yellow outline. I've also tested it on 1.20.6 and it works fine.

To Reproduce
Steps to reproduce the behavior:

1. Install a Minecraft instance on 1.21 with Fabric Loader 0.16.0, Fabric API 0.102.0, Sodium 0.5.11, Iris Shaders 1.7.3, Indium 1.0.34 and Pixel Perfect 1.5.1.
2. Enable Shaders and select Pixel Perfect 1.5.1.
3. Change either "Show Entire Selection Outline" or "Selection Outline Color".
4. Nothing happens.

Expected behavior
Expect to see the selection outline to change colors and/or show the entire selection outline.

Screenshots

Yeah, that fixed it, it now works as expected. Thanks! :)

👍

I've also fixed some more bugs in 1.5.2 which I'll publish in a few minutes, so you can use that instead of the beta pack when it's out.

Strike that, there's some pretty major issues on Optifine, but you can still get the (broken on Optifine) release here.

On it

Try this pack, and tell me if that fixed it please:
Pixel-Perfect-Latest-Beta-1.zip