I was playing around in an old (1.18) creative world of mine, when I noticed some trap doors have colours instead of textures, but only in certain positions.
I have included a screenshot of the bug, along with one of my F3 menu.
EDIT: This happens with & without Forge.
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Unless you can reproduce in completely unmodded (even no optifine) this is invalid.
This is not the first time it's reported here, and the past reports all used some modifications.
Also make sure it's not a resource pack doing this.
See MC-253658. Like @unknown said, it could also be your resource pack that's causing this.
Thank you for your report!
However, this issue is Invalid.
Your game, launcher or server is modified.
If you can reproduce the issue in a vanilla environment, please leave a comment.
Any non-standard client/server/launcher build needs to be taken up with the appropriate team, not Mojang.
Any plugin issues need to be addressed to the creator of the plugin or resource pack.
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Probably related to MC-181280.