IMS212
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Update: It seems like this is not restricted to Java, but this issue is happening across many languages due to a change in how date formatting is handled in Unicode. I'll look for a fix and post a code analysis.
I have managed to reproduce the issue on macOS, on a fresh install of Minecraft and Java 20.
This is definitely a modded environment, as this issue is caused by an mod failing to inject into the vanilla game code.
To clarify the image, what I meant was that the weather target is still depth checked in transparency.fsh. This means that even though depth writes are off, the translucency shader depth-checks it and (correctly) does what's shown in the image (putting the beams in the back).