After the texture update, many textures have been left unchanged. These have been reported when they were found inside the spectator menu and toasts, but no reports (as far as I know) have reported these occurring in Realms Menus.

How to replicate: Open the versions folder (of the game). Select the desired version and extract it to a folder using a program such as WinRAR. Enter assets\realms\textures\gui\realms. Both the map type images (adventure, inspiration, etc) and the trial icon which seems to be based off of the diamond texture have not been updated in compliance with the texture update.