Emit Relevart still spawning in Magnolia Blossom Park

As it says in the title, the game still spawns an Emit Relevart NPC from the time travelling event when you go to the park in Willow Creek. This is weird and annoying, because he still behaves like during the event, aka will always approach your sims and start conversations with them, so your sims can no longer go to the park in peace with a friend or date, Emit Relavart will always come to insert himself into their conversations. 

Emit Relevart has a hidden trait "isemit" that governs this behaviour. First, I assumed I only still have Emit because I play without aging and the devs assumed they don't need to code out this event NPC because he'll die and be culled, which of course doesn't happen for me. But:

When I delete the hidden trait off the Emit sim, he will start acting like a normal NPC (sometimes show up in the world but no longer specifically on this one lot doing the specific behaviours). I thought, yippie, I fixed it. Nope. The game spawns a new Emit Relevart next time I go to the park. This is what I'm reporting here. The event is long over, the game should no longer spawn the NPC for it. 

Deleting or killing the NPC doesn't work, the game spawns a new one. They aren't always named Emit Relevart, and don't always look the way the original character did, but they all have the persistent behaviour of trying the talk to your sims and they always have the hidden trait (traitisemit). Which means even the latest game version (fairies patch) still contains the code to spawn Emit Relevart. Please just take that out thanks. I liked this character but my sims want to go to the park in peace.