I have no hostile mobs in my world. The last thing of note I did was to apply a Looting enchantment (from a book) to my sword. I was hoping to try it out that night but nothing appears.
I still see hostiles in the Nether, so not problem there.
I've checked the difficulty and it was still on Normal. Switched to Hard and back and still no hostiles.
Edit: Windows 10 Pro, i9-9900, 64GB, 2xGTX1080.
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Set to Peaceful, Save & Quit, reloaded and set to Normal - mobs are back.
Update: They're not back in anything like the numbers they should be. Not a single one around my village and only a handful outside.

Thank you for your report!
We're actually already tracking this issue at MCPE-21856, 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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If you change the difficulty to Peaceful and back to Normal, does this still occur?