Having spent holidays for almost 3 weeks without Pleco, I installed 4.10 and started flashcard reviews with a score filter of 0-100 (self graded, test reading and test writing). I got 9 flashcards and gave 7 wrong answers. Due to "loop repeat incorrect" I got 7 cards again and gave 2 wrong answers. The third round with 2 cards was easy then.
For whatever reason I tapped Begin Test Session again without any change and expected to get no cards, but was asked to Resume Test in Progress. I said yes and started with card 6 out of 9 a new flashcard session. All those 4 cards (6, 7, 8 and 9) had just been tested, had new scores and were due about 1 day later. After that a loop with 5 cards started again, and only then the flashcard session was really finished and tapping Begin Test Session resulted in the expected Session Complete.
I actually use 10 profiles, and when this happened the first times I was not sure if I had made a mistake. But with the 8th profile I wrote down what happened, and it seems to be easy to reproduce.