This might be related to the "disabled spawn" bug from post https://feedback.bistudio.com/T124852

Player's that are kicked (gamecrash/teamkilling /.....) are not handles correctly by the mission:

Player Icon remains on the map
Active AI of the player remains (sometimes)

Here after messing a bit around:

1. Splix was kicked for teamkilling
2. His "AI" remained
3. Respawn was disabled when the tried to join the same slot.

https://youtu.be/bNzH2UFRw0o