I’m running into the same issue as well. I was able to get the newer imagery once, but haven’t been able to get it back since. This was all tested within a two hour time-span, so it’s not a daily occurrence. I believe the issue ties to the data that the sim ingests each time it’s loaded up.
For example I originally started with this imagery
Didn’t change any settings, restarted MSFS, and had this imagery
Then after the next restart, it completely reverted back to the old imagery. I’ve tried clearing my cache, changing graphics settings, turning data on/off…and nothing.