There is a bug that causes a significant frame rate drop/freeze when exiting a building (performing a run-out) while playing Training Grounds Lone Wolf - Protect Hostage. On my Xbox One X and Xbox One consoles, the game typically renders 65 to 85 fps unlocked. Immediately upon leaving the building and passing into the "red wall" caution area, the frame rate momentarily drops to about 45 fps (Xbox One X) or 25 fps (Xbox One) along with a 0.5-1.0 second "stutter" in the action. This is not just a visual bug; the game momentarily freezes and then skips forward.
This bug was introduced with the Y8S1 Operation Commanding Force update. It causes serious problems when attempting any sort of run-out against the AI, as it throws off your aim and timing. It is necessary to go outside in Protect Hostage, as the AI frequently gets "stuck" in the outside areas; you have to go out there and hunt them down in order to proceed to the next round.
It is very easy to reproduce. It occurs on every map and every time you run out of the building through a door or window. You can go back and forth across the threshold, and it happens every time. It does NOT happen when re-entering the building - only when exiting.
Please note the game is set to unlocked frame rate for PvE (V-Sync is turned Off). Also, my Xbox One X is using HDMI-Variable Refresh Rate to a TCL TV and my Xbox One is using a fixed 60 Hz refresh rate to a Sony TV.