Interaction with skeleton horses only exists on bedrock on java you cannot do anything with them
It’s probably just texture/model bug. The update is pretty new so devs should patch it really soon.
It is a common issue in Minecraft that had a place for a long time. It’s kind of bug that cannot be fixed directly. This mod removes the problem completely. https://modrinth.com/mod/modelfix
try launching the game without fullscreen at start (setting should be available in launcher settings) and after launch press F11 (fullscreen key) and it shouldn’t crash