Only thing i can add to this in terms of useful informations is, that i observed that the Frame Counter on display behaves weirdly. Also Output doesnt quite match the Selected Frames exactly. Usually wont be an issue, because i and probably everybody else would Select quite a bunch more frames than Actually needed, but still strange and i assume not as intended. Dont know how much this is related to the Issue of that Never ending Save, but wanted to mention it, since it seems like there could be a possible connection here. Never had any save that wouldnt end myself.
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Did record a couple of different Saves and put some commentary into the Video. Lot of Hard cuts in there, feel free to stop the Video to read the Text and Settings on Screen (or whatever the Frame-Counter displays) properly.
Didnt do any further research or testing with this, shown behavior is just meant as an example to see, that there is an Issue or something a bit off there.