Video explains it best, preset attached Blender 4.5.5 ZenUV 5.2.1.1. https://cdn.discordapp.com/attachments/1448983063139844176/1448983063382982757/2025-12-12_11-10-45.mkv?ex=6949c463&is=694872e3&hm=3ebf0cf79c43e462fe216eb8f5e21c486eeb6eace5b4ccbb86abb0091a999263& https://cdn.discordapp.com/attachments/1448983063139844176/1448983063726919680/Lele.py?ex=6949c463&is=694872e3&hm=a4ec044313985dcc3bd5889e3001c1d8c7b5e09a5889d17efca847143d0a49e7&

Hi, I can confirm the issue. Comment these lines, until I will find the reason why it happens

Thanks!

This is a pure Blender bug which has appeared since Blender 4.3, I made a bug ticket for Blender developers: https://projects.blender.org/blender/blender/issues/151541