In occasions starting a Raid mobs walk to the village as intended but at higher waves mobs begin to spawn in caves and not moving from there, sometimes it gets impossible to find them because they spawn occasionally on random closed caves,
Randomly they just disperse away form the village, lose interest on it and walk away.
In my opinion as Java Edition we need the option to hit the bell to highlight raid mobs and make easy to find them.
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Thank you for your report!
We're actually already tracking this issue at MCPE-45183, so I will resolve and link this ticket as a duplicate.
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