Since 0.15.x, redstone and components could be placed on glass, which was confirmed as a PE exclusive feature. However, this behaviour is missing for stained glass added in the 1.2.x beta.
Steps to Reproduce:
- Place some stained glass
- Place redstone dust on the stained glass
It's not possible to place redstone items on the stained glass.
Logically, it should behave in the same way as regular glass.
Screenshots/Videos attached: Yes
Please see ticket
MCPE-16872 for intended behaviour for glass.