Glow inc sacs or dyes with the CanPlaceOn tag validly set can't be applied to signs in adventure mode.
It works, just like putting a book in a lectern, stripping a log with an axe, etc. (use item on block)
It doesn't work.
- Place down a wall sign
- Go into gamemode adventure
- Give yourself an glow ink sac with the following command
- Try using it on the sign
-> It doesn't work.