I just completed a 1 hour 20 minute VFR flight today. When I restarted FS2024, it was gone. Yesterday, another flight of almost 3 hours also disappeared.
This problem has been known to Asobo/Microsoft for almost a year, and currently, nothing has been done about it. Microsoft and Asobo don’t seem to care, and I think that even with SU5, this problem won’t be fixed. All they want is to sell us their marketplace.
I prefer to stop here because if I continue writing, I’ll be very impolite, even insulting, towards them. 
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Post it as a question for the next dev q&a, it might get picked up.
Horrible … a simple logbook 
My guess is that it’s a cloud save desync problem; your local logbook shows correct information, that information doesn’t get saved to the cloud for whatever reason, and when you restart, the cloud save overwrites the local information. Just guessing though.
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Perhaps slightly more nuanced than that. In my experience it only loses some flights from a session, so I would presume there is some sort of issue with merging newly saved flights into the logbook. Its been said that the logbook looks like a file on your local disk somewhere, and its saved to the cloud as well so there is probably something slightly more complicated than just uploading/downloading a file going on. We have been previously advised that they are having trouble reproducing this issue, hence its feedback-logged rather than bug-logged. I would have thought the easiest way to debug it would be to examine the data merging transactions for a real affected live user rather than trying to recreate the issue in a test environment.
At least I’m not the only one. The logbook seems to have missed more entries than it has saved.
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Definitely.
End of november I stalled Volanta and have logged every full flight I did there. ~400 hours.
The in-game logbook shows ~280 hours since I got MSFS2024, which was on day 1. And this includes all non-completed flights i did to check performance or scenery.
So the in-game logbook should be over 2.000 hours, while it actually recorded less than 300….
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I find that if you restart a flight just after loading in, the flight that you then do will be kept by the logbook
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So restart at the beginning, rather than the end? The latter I had read about.
Yeah load in at the gate/stand. I tend to enter the cockpit and then open the menu. Press restart flight. Let it reload and then continue as normal. Then then flight is logged for eternity
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