Steps to reproduce:

1. Create item which will be not supported and have schedule interval like m0-59 and main update interval set to 0
2. Make trigger with this item with nodata(30m)
3. Enable internal action for this

Result:

Expected:
Do not flood events/problems, this further makes extensive workload for housekeeper, especially on large instance, which basically causes same "fixed" issue with deadlock on the event_recovery/events: https://support.zabbix.com/browse/ZBX-16925 due to high amount of such not supported items.