pure survival world, no cheats on, about 200 mb big world file, mobs doesn't spawn in the world and can only fixed by set the difficulty to peaceful, leave the world, rejoin the world and change the difficulty back to hard
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Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Cannot Reproduce. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.
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Do you have a lot of other mobs in the world? You have probably reached one of the mob caps so you will need to kill some of the other mobs for new ones to spawn.