Hello! I opened the sprite in the mask editor and I get the same thing. It doesn't look like its masking it out and I can't edit the mask on the outside of the shoe sprite.

this seems to happen on import
Peter (RL) (2/15/2022)
Hi...
Try selecting the right foot and then select "Mask Editor" from the left side toolbar to check that the full sprite is visible and not masked off in any way. If it is being masked off in that area you can remove the masking in the Mask Editor. Do also try clicking Preview and then move the right leg like below to make sure that part of the foot is not being obscured in some way.
