This has become such a frustrating pattern with Meta Ads over the last 60-70 days. One ad creative will sh!t the bed overnight. It doesn't matter if you are on ABO, CBO, CostCap, BidCap... The bed will be shat on - almost every night.
And... If you turn this creative off, the campaign will go haywire. You have no option but to wait for it to stop spending by itself.