What Will Prowse is discussing in that video is EXACTLY what is going on here. He is actually discussing it regarding WattCycle “smart” batteries but notes that the issue is with other “Smart” batteries as well including LiTime. Also many comments on the video from users experiencing this with LiTime.
Also, a related issue with the BMS cutting out and reconnecting during absorption charging from the Multiplus causing large voltage swings . I found this other post that is worth taking a look at if anyone is interested. Multiplus 12/3000/120-50 120v voltage swings in Absorption and Float
Fortunately LiTime is taking these batteries back.