Once every two or three raids, bots fail to spawn in, i notice the server window usually writes something about a weapon missing (a mosin of some sort) and that it is unable to generate a marksman or a followerglukhar bot, then it tries to generate bots on repeat to no avail until i close the game or extract. I have tried to remove every mod except SAIN and SPT realism, but no matter what other mods i add and remove, the issue persists, even after reinstalling SPT and downloading the mods again.
I strongly suspect the issue is caused by SPT realism as the server message is tagged as an SPT realism message. It writes something along the lines of:
"Realism Mod: failed to find custom preset for bot marksman. Using default.
Weapon 5ae08f0a5acfc408fb1398a1 was generated incorrectly, and has returned to previously adjusted weapon see error above"
I do sometimes see the error in raids where the bots successfully spawn, so this may be a red herring, but it is always one of the first things to pop up in the server window when bots fail to generate.