https://www.boxofficemojo.com/alltime/weekends/smallestdrops.htm?page=DROP3000&p=.htm
Looking at the all-time smallest second-weekend drops, at least for 3,000+ theaters, CRA's hold is unprecedented.
Everything above it was helped by virtue of having its second weekend being a holiday, like Christmas, Thanksgiving, or Memorial Day in Shrek's case. The only arguable exceptions are Puss in Boots, which had its first weekend deflated due to opening on Halloween weekend, and Brother Bear, which opened on a Saturday.
The closest examples when it comes to CRA's case (3,000+ theaters, not opened on a poorly-attended box office holiday, nor had a holiday to boost its hold), there's The Santa Clause 2, Elf, and Argo, and those only dropped around 15%. Insanity.
I guess Jon Chu was right that moving this to Netflix wasn't best for this film.