If a resource pack name's contains this character § and is in the "Selected Resource pack" section, on the reboot of minecraft it will be rejected
Linked issues
Comments 3
Sounds like MC-117449?
Yes, it sound a bit like MC-117449
MC-117897
Resource pack gets rejected on launching the game because of special character
Resolved
Duplicate
1
Can confirm. Resource pack folders with "§" in their name will be deselected by Minecraft upon restarting the game and have to be selected again to use, the game remembers all other selected resource packs.