Resource packs that contain special characters, for example section signs, do not stay loaded when minecraft is launched and instead have to be re-selected every time the game opens. Resource packs without these characters stay loaded as expected/
Linked issues
Comments 3
If you name a resource pack §6Resource Pack, it will not be "remembered" as the pack that you have selected when you close and re-open the game
This is caused by the options.txt file being read in system-specific encoding, see MC-117449.
What do you mean with "Resource packs with special characters"? Can you attach an example resource pack with which the issue occurs? Does MC-135110 describe your issue?