Edit a world's simulation distance to anything higher than 4 chunks.
Start up world then look at your settings to find simulation distance has changed to 4 chunks.
Link to video showcasing this issue.
MCPE-168940
Preview 1.19.80.22 Simulation Distance Bug Forcing Sim Distance 4
Resolved
Duplicate
0
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We're tracking this issue in MCPE-168513, so this ticket is being resolved and linked as a duplicate.
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