On my game, mobs (monsters) are not seeming to spawn even after waiting in the dark on survival and normal difficulty. Please do fix this as soon as possible.
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Thank you for your report!
We're actually already tracking this issue in MC-155289, so I resolved and linked 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.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.