Fireblanket with zstd enabled is unkind to vanilla, tho 26.1 did sorta fix that problem by moving the overworld outside of level.dat.
The best solution would be to set the DataVersion to have an incompatible series, and set the saved version name to something reasonable for the player.
Candidate for version: Fireblanket $minecraftVersion
Candidate for series: fireblanket:$series
Fireblanket with zstd enabled is unkind to vanilla, tho 26.1 did sorta fix that problem by moving the overworld outside of level.dat.
The best solution would be to set the DataVersion to have an incompatible series, and set the saved version name to something reasonable for the player.
Candidate for version:
Fireblanket $minecraftVersionCandidate for series:
fireblanket:$series