In an older version of the game, the Alex model would mirror the right leg onto the left, now, it simply copies the texture over with no mirror. It looks super janky and ugly and it's really annoying, especially for someone who is a skin artist. To spend all that time just for the texture to not even be correctly mapped to the model is so frustrating. Even the marketplace skins are doing this! PUBLISHED PACKS have the same issues!

How it looks in-game:

notice how the skirt looks really weird. I chose a skin with a skirt specifically to highlight this issue.

vs how it looks in my skin editor (and on Java edition)