There are two separate issues here.
One is many entities stop colliding, either fully or partially, they also appear to have no friction. This issue also happens from time to time on Wire Build, so if you've seen it there, you know what it would look like on Fretta.
That issue appears to occur in a few gamemodes. So I do not believe it's gamemode specific. Just today I personally saw it happen on 3 separate gamemodes, and yes one of them was Chimera Hunt, but it's not just limited to that gamemode.
The second issue $ilent brought up is due to a sanity check the Chimera Hunt gamemode does on timers... The code is perfectly logical, but for some reason timers fail, it then reloads the map...
Both issues are being looked into and will hopefully be resolved soon.
P.S.
Bill Cosby in Chimera Hunt map much? LOL