Plenty of 737 Max jets are changing their colors at the moment. The cancellation clauses of the purchase contracts have allowed a bunch of airlines to cancel their orders without penalty as a result of the extended delays in delivery – something that may have been welcome during the pandemic! Boeing has seen an uptick in demand for airframes recently and has been mostly successful in reselling these finished airframes.
This one showed up recently at Boeing Field. It is all white so may have been identified as problematic before it ever got painted in airline colors. The people I was chatting too had no idea where it was due to go and whether it could even be a BBJ. No doubt it will soon find a home if it hasn’t already.