Mobs spawned by spawner.json spawning on non-full-block blocks

[martinkoeth]

I mostly spawn mobs with spawner.json and configure their spawn requirements in special.json and spawn.json. It works fine, however, monsters will also spawn on stairs and other non-full-block blocks.

My configurations: special.txt spawner.txt spawn.txt

[McJty]

This is solved in 1.18+ with the new 'sturdy' keyword in spawner.json