creeper texture error

The texture of normal creepers appears as that of charged creepers while using the classic Minecraft texture pack. This bug occurred after I tried to code a behavior pack that allows iron golems to ride on horses. However, after deleting the behavior pack, re-downloading the classic Minecraft texture pack, the bug is still there, as long as the classic Minecraft texture is activated in the settings of the main menu, even if it is not turned on for a specific world