Alex...
Thought maybe you might had ended 2020 with a 'bonfire' using that oven as kindling
Those holes are for ignition of the Main Flame...gas blows out those holes into the Pilot Flame
Set back is so the propane flowing out burner mixes with air and blows into the end of Pilot Flame for ignition
Repost of your oven flame....that is a great looking Main Flame, Ignition Ring, Pilot Flame and Thermocouple Tip is RED
Everything about that oven burner/pilot/spark electrode/thermocouple should result in steady oven heating/temps
WHY it pops and goes OUT ?????
You have replaced everything that could have be the culprit EXCEPT for replacing that unit entirely
Did you ever send video to MFG???