I'm currently using OpenTerrainGenerator (OTG) to design a terrain base for an aquatic modpack. The issue I'm encountering is that a mob_spawner will not update its tick cycle in my overworld. (See attached image for data obtained via the /blockdata command.)
What's weirder still is that the particular setup works just fine in another OTG overworld map, where I initially designed/built the structure to be used in my modpack. So I know there's a) enough space for the Blazes, and b ) the light levels are low enough for them to spawn.
I've double checked that my view distance is at least 10 chunks, and that the modpack-world difficulty is set to something other than peaceful. I've saved, closed, and reopened the client as well.
I'm discussed my issues with the OTG creators on their discord, and they are coming up empty as well.