I don't know if this is an intended feature in 1.19.60 but I was testing if mobs (e.g creepers and skeletons) can spawn inside glass. This ended up to be the case with I tested it with normal glass and tinted glass shown in the screenshots provided. I know that spiders and baby zombies should spawn in these conditions
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Is this still an issue in the latest version? If yes, can you please add it to the affected versions (or mention it if you are not the reporter)?
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For clarity: Instapush still exists in 1.21 in structure spawn farms, where mobs still spawn in northwest corners of blocks.
Can confirm in 1.21.1. Here's how i was able to reproduce this issue.
Create a new superflat world with cheats enabled.
When you join the world set your gamemode to creative and run the following commands in order:
/fill ~-32 256 ~-32 ~32 256 ~32 grass_block /fill ~-32 258 ~-32 ~32 258 ~32 glass /time set midnight /tp ~ 259 ~
After a while hostile mobs will spawn with their heads being inside glass
Mobs have always been able to spawn colliding with blocks made of non-solid materials like glass, leaves, and ice (regular, not packed or blue) in Bedrock Edition. Mobs initially try to spawn on block corners, at the center of 4 blocks. When the corner spawn position would make the mob collide with a non-solid material block, the spawn position is offset to one of the 4 blocks if there is empty space. (This is known as "insta-push" in the technical player community and is used in many farms.) If all 4 spaces at head height have non-solid material blocks then the mob spawns with its head inside them. This often happens with tree leaves MCPE-47846. Apparently it used to happen with all blocks but was fixed so that solid-material blocks specifically would cancel the spawn, but non-solid material blocks would not: see MCPE-31193. For that reason I think it is likely working as intended.