Mecreeps allows you to create a portal gun, using it creates a portal on the ground that you can walk up too to TP to the destination. Tar minions when they get killed or time runs out drop a inanimate tar minion.

If a tar minion happens to walk over one of the portals it is TP to the destination but it also is being seen as a death ( I think, no message is spammed ) and creating a new inanimate tar minion.

Since its a exploit due to how two mods are interacting I'm not sure what could be done but I thought I'd say something.

Hello, thanks for the report. However, the issue template is there for a reason and there's a lot of information missing in your report, so please use the template next time.
This seems like a bug in MeeCreeps, I'll report it on McJty's repository.

Yep, it is indeed a bug in MeeCreeps. Same thing happens with Chest Minecarts.

Report is here: McJtyMods/MeeCreeps#56