Can confirm. Started a FFA match and for the first thirty seconds or so it was glorious mayhem. Then everyone just clumped up in the middle of the field and did nothing until attacked.

This also happened in my game when I tried to play the light mech FFA.

I recently added "Arena Control" to my modlist and it has an option to force mechs to engage. I use TTRules_AIMod2 as well and it seems to have improved the "mechs hide from each other in FFA" issue that I've had since I bought the Solaris DLC

https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3238658385&searchtext=arena+control

Could be placebo, but it has lots of other useful features that help, ie forcing smaller arenas and being able to never have to get Jackson and Cooper as announcers, as well as setting the weighting so you could never have to see FFA or Open matches if you wanted

This mod doesnt do this. It happens with the base game.

I dont have this mod thats how i know.

YAML has an easy fix - use magpulse missiles and those AI clusters will be smoked in no time.

LOL!

Can confirm this is a base game bug. That and when they spawn you in a mosh pit the AI shoots at you during the intro camera sequence.

Can confirm. Happens a lot. Worst is on that circular junkyard map. 11 mechs, no one shooting at each other. They only start combat against me if I shoot first. Not consistent but happens enough to make it frustrating.

This is wrong. The vanilla Arena AI has issues, yes, but TTRulez, even with the "Arena fix" on Nexus, which wouldn't exist if there wasn't a problem, doesn't fix it.
Compared to the issue riddled vanilla Arena AI, Arena with TTRulez is a joke and completely different game and always a free win.

Again, if there wasn't an issue, the author wouldn't have attempted to fix it.
No matter how much you guys want to cling to your make believe.

Tried this mod with Vonmissions, AI does that thing where they turn to block shots with their arms but since it's the very 1st thing they do after shooting once; every bot is facing away and dancing in circles with no one opening fire.