Rendering issue for ALL Minecraft skins.

Is the skin designed to be use with the slim or classic model? Are you sure you're selecting the correct model when importing the skin?

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Doesn’t happen when it’s slim, only happens with classic model.

Doesn’t happen when it’s slim, only happens with classic model.

Please attach an affected skin file.

This isn't a bug, the skin file you've attached is for the "slim" model, not the classic one, hence the empty spaces.