Hard AI resigned on Regicide 2 (us) v 4 (AI team) despite no fights

Game build : 101.101.46295.0 6421374
Platform : Steam
OS : Windows 10

Issue : 2 of the 4 Hard AI resigned before reaching imperial age, despite no interference on our part. The map was Scandinavia

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Replay : https://1drv.ms/u/s!AraFrk78NEdBtBRhG9cH72LSS3Rq?e=fAqfLC
Frequency : happened once (Less than 25% of the time / matches I play (RARELY))
We did several games like this one, but on different maps without any problems, but maybe different levels of aggression on our part.

Here’s the steps to reproduce the issue: (I don’t know if you can or not)

  1. setup 2 human players vs 4 hard AI on 6 player sized Regicide scandinavia map
  2. Let the AI go fast imperial
  3. Profit?

Expected result : A couple of AI will resign out of the blue.