I am experiencing this same issue, which made me come to the forums and eventually find this thread confirming I was not alone…and more importantly I was not going crazy…
I am still adding new movies to our library. I am manually tagging movies into my own collections. I have followed the naming convention. I have turned off the empty the trash after scanning.
I have pretty much the exact same experiences. I ONLY loose my collections tags while it still remembers my Poster / Background / Sorting Name / etc… I have noticed a few points of action when it happens…but the key word in each point below is “random”…
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Randomly. Simply a movie is in a collection and then when I look again ( 3 minutes or an hour or a week later) it is not in that collection anymore. No rhyme or reason I have found for this can be mvk/mp4. All movies originally matched meta-tags with no issues when originally uploaded. No other meta tags are missing.
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I have noticed that if I change the Poster at the same time I add the Collections…I have a about a 50/50 (random) chance of losing the collections if I go right back in just seconds later.
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If I upload new movies and manually initiate a scan for new movies…I will pretty much be guaranteed to lose my collections tag on previous successfully meta-tag’ed match movies that I manually tagged to my own collections on a random few movies.
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If I watch a trailer, I have find I often (not always, randomly) lose the collection tag.
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I originally thought that when I started a movie for the first time after loading a successfully matched metatags when uploaded and then manually assigned it to a collection…then it would randomly lose the collection tag, but maybe it was just coincidence with one of the other factors above.
I have been building my collection for the first time on Plex over the last 3-4 weeks and I really spend a lot of time manually organizing our movies into collections and this is so frustrating when I have to re-assign movies over and over and over again. Simply a waste of time on an already (when done right) time consuming process to begin with.
At work, one of my responsibilities is to identify bugs with our international enterprise managed mobile devices and software…and after reading the experiences shared in this thread (and a few others from earlier in the year) that line up nearly exactly with my own observations, it does seem like there is a bug with how Plex stores / refreshes / overwrites / deletes / etc… ONLY the Collections metatag.
