While playing on a vanilla minecraft server, we observed that several times in a row the server would crash when a player who zombified piglins are angry towards travelled through a nether portal to the overworld. A player who travelled through who did not have zombified piglin aggro would not crash the server on going through the same portal

The aggro isnt neccessarily the cause of the problem, but its the only correlation we can identify. 

This report is overly vague, due to the lack of observable cause for the problem. Since this is only an issue on online servers, its difficult to continue testing it, as I don't own the server and don't want to crash the server constantly. Any theories or explanations would help