Exit crashes are avoided as much as possible, but can happen especially with some older games. That’s the nature of the beast. A game might exit before the Oculus/OpenVR runtime has a chance to unload for example, which may cause problems in some cases.
The warning is perfectly normal, always happens on submitting the first frame with OpenVR, nothing to worry about. Warnings in the log aren’t errors, a warning usually is just meant to highlight certain messages.
In general please don’t report problems with unsupported games as vorpX issues here unless you verified them with a supported title. Thanks. Unsupported games may or may not work or show all kinds of unusual/unintended behavior.