I know this issue exist but by releasing adventure time x Minecraft episode (diamonds and lemons) I wanted to use adventure time mash up pack but when I downloaded it and applied it , many (close to all) of textures was missing and I can't enter any of my worlds (because its crashes) also I can't make adventures time world template , it says there was a problem with this world and an OK button. I figured out that android , ios , switch (and may some other platforms) can't handel and deal with content.zipe file in resource pack folder. I say that because plastic or neture resource packs (that don't have content.zipe) working very well. (sorry for my bad English)