This got fixed in 115.8.0? Just happened to me in 115.11.0 but I cannot tell if it was due to moving/deleting anything. Autocompact just started doing it's thing and then all my emails started to re-download for one of my GMail accounts.
Bug 1725127 Comment 64 Edit History
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This got fixed in 115.8.0? Just happened to me in 115.11.0 but I cannot tell if it was due to moving/deleting anything. Autocompact just started doing it's thing and then all my emails started to re-download for one of my GMail accounts. My "Compact all folder..." setting is set to 250MB.