Here is my evidence.
As you can see on Picture1 and Picture2. I join two consecutive battles. The plane “Spitfire F Mk IX” get about 8000+18000=26000 research points. However, the Picture3 shows that plane only need 18000 research points. I lose the research points (about 8000) on the battle which shows in Picture1.
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This happens to modules too.
If you want a workaround: Change research target (module or plane) if you are near completion. Change back when the mission is finished. That way, you won’t waste the points.