I found a raid party near some water. I killed three pillagers, but couldn't see the captain. I found it swimming in a shallow body of water, maybe 3 blocks deep. I swam at it and killed it with both of us in the water. The Bad Omen Debuff was not inflicted upon me.

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THIS REPORT CAN BE CLOSED. THIS IS NOT A BUG. THE SERVER LAG CAUSED AN ERROR WHEN TRYING TO GIVE THE DEBUFF