Pugger

I also have this exact problem, but it persists well after I turn off all my texture packs. (Over 50 times opening and closing worlds). However, closing Minecraft and then reopening it fixes the issue. I am on Windows 11. I think this started around April.

Here is what I have found:

1. The texture can change every time a world is opened. That includes the texture being normal.

2. It can affect almost all textures

3. If you screen record with Microsoft's game record, nothing is wrong when opening a world. I know this sounds very weird, but I spent over half an hour trying to reproduce the glitch while screen recording, and it never happened. However, once I stopped the recording, it happened right away multiple times.

4. It also happens on independent and featured servers much more severely as in more textures are changed

5. In total, the textures I have seen changed are: prismarine, llamas, wandering trader, mooshroom’s mushrooms, magma blocks, (soul) fire, (soul) campfire, sea lanterns, all command blocks, respawn anchors, all sculk blocks, mooshrooms, player inventory, player hotbar, pause screen, any UI button, player model (steve), both bubble collums, kelp, surface of water, nether portals, crosshiar, potion icons, any particles, text background in inventory, and lastly some items get replaced with vertical lines.

6. I haven’t found a reliable way to reproduce it besides spam opening and closing worlds

All the textures above do change, just didn't get a screenshot of them changing. Not glass or grass. (no unanimated block change texture)

All of these screenshots have been taken in the last hour.