In a villager trading hall which traps the villagers on beds covered and surrounded by glass. Previously I've been able to place the profession blocks at the end of the beds which the villagers can pathfind to and use. For no apparent reason the profession blocks are no longer activating (no particle effect from the block or a villager). I cannot replicate this bug in a creative world where an identical trading hall works fine.
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Thank you for your report!
We're already tracking this issue at MCPE-49580, so I will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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Update, now the villagers don't recognise the beds either.