Unable to deserialise packet with pid 18516

I've gotten this crash error on two separate occasions. It's definitely tied to the map instance because it kept crashing until I started a new instance for that zone.

Thank you for this. For everyone else, this is the issue. Even if you havent had an instance in the area, this error happens. Did a new instance and it fixed my issue.

Got this error just now on trying to enter a Sulphuric Vents map, Tier 10. No content on the map. Cannot make a new instance via portal as I guess the maps are one instance only (would make sense). Four crashes to desktop in a row.

Additionally a website is getting blocked from my Malware Bytes after these crashes, coming from the PathOfExile2Steam.exe file. I've never run into any concerns from Malware Bytes before, aside from launch day with the standalone client (easily fixed by adding an exception). This continues to happen each crash, despite adding the exception in MWB. Is the client trying to send a bug report and failing? Something linked to this packet?

Mawdun Quarry for me trashed 8 times in a row trying to get off the caravan