The left eye blinks black frames when it's raining when Sodium is installed.

Tested this with Vivecraft 1.21.4-1.2.1 and Sodium 0.6.6 (Tried also lower versions, same issue)

Once it stops raining, it stops blinking black frames. It also affects the text on menus on both eyes

only vivecraft and sodium?

Yes I tried it with only vivecraft and sodium (and fabric api 0.114.2) Fabric loader 0.16.10

I get a similar issue. The UI starts to flash black. The left eye doesn't flash black for me, but I do notice the UI doing it.

if it's just the UI, that can also be caused by journeymap

It includes the world geometry

this was meant in response to the other guy

I don't have journeymap installed

okay I did some testing, the tex on guis always filckewrs for me, the left eye terrain only flickers when the stencil is disabled
haven't found any cause for it yet though, apart that the lightmap texture doesn't get bound for some resason

and it doesn't happen with nullvr for some reason, which doesn't make sense

could you guys check if this fixes it for you?
vivecraft-1.21.4-1.2.1-flickerfix-fabric.jar.zip

Will do, give me 5 minutes

Doesn't flicker anymore for me. Bravo 🥂