Last night (August 7th), I encountered this issue when I was on Mission 8.
After defeating the F-5E squadron as planned, the plot indicated that 410 had been hit again and needed to make an emergency landing at Ras Al-Khaimah. This is the same issue I found mentioned in a thread. The 410 couldn't be controlled as a wingman via radio, I was helpless when he hovered in the northwest direction, ignoring the plot's instruction to fly towards Ras Al-Khaimah.
I had already reached above Ras Al-Khaimah and was circling, waiting for the 410 to join me. However, he stubbornly remained in the hot zone.
Realizing my fuel was bingo and the tanker hadn't respawned, I decided to land at Ras Al-Khaimah to refuel. Surprisingly, after my landing, the 410 started to follow the plot and flew towards Ras Al-Khaimah, initiating the emergency landing procedure. Unfortunately, a spoiler: the 410 crashed on the runway just before touching down, suggesting a fatal outcome.
The plot then proceeded as normal. I returned to the sky (despite the plot requiring me to monitor the 410's landing in the air), performed an aerial refueling, and finally returned to base.