Strays and other mobs can spawn on top of glass via a trial spawner.
Steps to Reproduce:
Method 1:
Build a large flat platform of glass
Place a trial spawner 1 block above it
Use a mob egg on the trial spawner
Enter survival to activate the spawner
Method 2:
Load into this world:
Enter survival
Wait for mobs to spawn on the glass
Attachments
Comments 4
I can confirm that breeze mobs can spawn on top of glass using a trial spawner. However, both kinds of spawner blocks do not exactly follow the same conditions that mobs normally follow for which blocks they can spawn on top of. Spawners can even spawn mobs in mid-air, allowing them to spawn above glass.
Steps to reproduce added to the report.
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World download is avail under this issue:
MC-276647