Ok, here’s a new one...
I was developing a roll of D100 in a Paterson tank today, all going really well processing in ID-11 1+1, until it came time to dump the developer and pour in the water stop bath.
....I peel the seal off the top of the tank to pour out the developer, dump the tank on it’s side to pour out the developer, and not only does the developer dump really quickly, but the inner lid slides out together with the film reel and film, which proceed to all dump into the sink. (Yup, the inner lid obviously wasn’t fully snapped closed, and yup, film is really weird & milky looking before fixing).
Thinking that I might be able to save it, I quickly slammed the reel back into the tank (upside down, it turned out), reattached the lid, firmly snapped it closed, pour in the water stop bath, and agitate the heck out of it before dumping the water stop and fixing the film normally.
I did get images that were actually pretty evenly developed, but with some slightly brown fog along one side of the film that lessens across the width of the images, presumably due to re-exposed halides at the end of development being somewhat reduced by developer that was still present in the emulsion. In retrospect it would likely have been better to skip the water stop bath and go directly to fixing the film, but I was slightly amazed that I got anything useful.
Anyway, new lesson learned - always check that the centre tank lid is securely fixed and snapped in position before starting any step of the process...especially before dumping developer!