While mobs do not naturally spawn on a glass block, mobs do spawn on tinted glass.
Apologies if this was as intended feature.
Environment
Windows 10 Version 20H2
Java Version 8 Update 281
Dedicated Server Version 21w07a
MC-216571
Mobs spawn on tinted glass
Resolved
Duplicate
0
Hello! This appears to be a duplicate of MC-203918.