When I made a behavior pack and increased some of the mobs' detection ranges, most of them failed to detect me from a farther radius. For example, if I set a Wither Skeleton's detection radius to 40, it wouldn't correctly chase me from 40 blocks away. I hope this can be fixed soon.
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We're tracking this issue in MCPE-50207, so this ticket is being resolved and linked as a duplicate.
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You need to change both their targeting range and their following range for this to work. See MCPE-50207.