It might also be an elaborate psyops from some of the Iranian factions plus Pakistani and Chinese governments. Just to nudge Iranian society into a more pro China and Eurasia direction. Given how the pro western liberal agenda has failed now that Israel has attacked Iran and the US is wondering if it should join those attacks. Also we now had the Iranian Military folks "confirm" that China and Russia offered help etc.
On a different note I could see this as an moment to gather a treasure trove of invaluable data for China and Russia. This is like a once in a decade moment to record as much data as possible from US stealth bombers doing bombing runs. Given those planes would also be used against China and Russia. Once you can find this needle consistently in the haystack of sensor data that will give you an invaluable advantage.
This might also be a good opportunity for China to try out some of their new algorithms to detect stealth planes. I think they published a way to find stealth bombers/fighters by analysing Starlink other LEO satellite signals disturbances for example.
