The Solteris raid is still very buggy. Saturday 4/9/2022 we did this raid on live with 120's. 1st event - worked fine. 2nd event - worked fine. 3rd event - was interesting. We did not have a necro so we had issues with balancing down the spawns. Failed balance 10-15 times just trying to 'power' through the event. Finally found a necro willing to come out and while we failed it again a few more time eventually we got the chest. 4th event - had 20+ Astire the Lunar Eclipse up. It seems every time we 'reset' event #3. it spawned extras of event #4. 5th event - We killed the boss out of order and bugged the event. Ended up having to drop the DZ and restart 3x. 6th event - normal 7th event - fine. Bottom line. At 120 the event is still very easy to bug out. Fixing the 3rd event was a step in the right direction, however, the fix has some side effects.
I did this raid solo (twice) since the changes. I had no issues. The golem event, if unbalanced, simply spawned high HP golem adds on each wave. Once you get to the split total of 8, kill it all.
It is likely we were doing too much damage and killing the splitting mobs so they didn't have a chance for the script to trigger the next split.