As I read the release notes, it occurred to me that this is definitely only a display bug.
https://cloud.google.com/appengine/docs/standard/python/release-notes When 1.9.55 was released last month I swapped json for ujson and re-deployed, so the instance cannot be running either of the reported versions. (For some reason I missed the connection back then.) I double-checked in Stackdriver Debug that it's actually ujson. -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-appengine+unsubscr...@googlegroups.com. To post to this group, send email to google-appengine@googlegroups.com. Visit this group at https://groups.google.com/group/google-appengine. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/d1d9b84c-3f74-48e7-8a4f-ed03610e3503%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.