When right clicking a bucket filled with "acceptable water" on a newly placed vanilla campfire the game hard crashes to launcher. Only way i can reliably replicate it is to use a new campfire with acceptable water. Using dirty water, or slightly dirty water first will allow acceptable water to purify after.
Modpack - Desolate Planet v1.6.0
https://www.curseforge.com/minecraft/modpacks/desolate-planet