One of the coolest things about minecraft is the ability to use custom maps officially and through mods made by the community.

However, I witnessed two errors that happen when I play in this style of world.

First mistake: changes in Skins.

When entering customizing maps (official or mods), pressing the pause button and going to the option to change characters, all the skins that I have are changed to Steve's default skin. But when I go back to the home screen my skins come back normally.

Second bug: Customizing map texture may appear on other worlds.

In this case, if I'm playing in a custom world, exiting it and opening another world may have parts of the custom world's texture on a default map. This bug was only tested on official maps and the texture change was very subtle being in the selection of items. I'll put an arrow on one of the images to better highlight the texture change.