If iron golem surrounded by tridents, it won't be able to walk out of the circle and being "locked" in the center.
The same thing happened on villagers when they try to walk through the bed which another villager is sleeping in.
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There was a change that meant that tridents can collide with mobs a while ago. It might be related to that.

Thank you for your report!
We're actually already tracking this issue at MCPE-60895, so I will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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