I deliberately did not mention 3D skins because they are often blocked by servers. Therefore, it would not be 100% proof that it is really due to Minecraft.
I disabled only allow trusted skins
This minecraft client got installed yesterday and all i did was adding development ressourcepacks, custom servers and the 3 skins you can see in the video.
I know another friend that also has the same issue
I am also dealing with weird graphical issues with Minecraft since v26 which disappeared after doing a clean reinstallation of Minecraft
It is definetly not working as intended. When joining my own server it also resets my Skin even though i am literally doing nothing with skins serverside…