I remember them stopping around 2018, as i had a personal experience with one that didnt make any sense; essentially i was told during my college classes that bleach was a strong hydrochloric acid solution and i was all "uhh no bleach is basic, a solution of sodium hydroxide." Ive known this since a kid, as i tend to read labels alot. The teacher had me open the book and sure as shit it said bleach was hydrochloric acid. This one had me literally shaking, it was fruit of the loom level mandela effect for me, but nobody else seemed to notice or care. A few months later the mandela effect came up in conversation, i brought up the example of bleach and went to look it up, aaaand it was back to being sodium hydroxide. My first and only experience of a so called "flip-flop"
Anyways, what happened around that time? December of 2018 saw the CERN LHC shut down for their "long shutdown 2 (LS2)" that is supposed to end by the end of this year.
...shit is about to get a whole lot weirder once they turn that fucking thing on again