As you can see, after the game was updated to 1.21.80, all normal Creeper textures were externally enhanced with this stationary Charged Creeper-like blue arc surround
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Do you have any resource packs enabled? If so, does the issue still occur if you disable them?

No resource packs or behavior packs have been added

Can you attach a screenshot of Settings > Global Resources and the Resource Packs tab of the world you’re playing in?