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Bug
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Resolution: Cannot Reproduce
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None
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1.12.0.4 Beta, 1.11.1, 1.11.3
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None
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Unconfirmed
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Windows

As told by this gif, the mouse will not lock to the minecraft screen, which makes the game unplayable if you have 2 monitors or play in a window.
Until this can get fixed I simply can't play Bedrock edition.