Error editing polygons or points on any feature

This is after the upgrade to 4.3.1 and HTML5 2.4.1.

The edit appears to apply but I get the following error message. This only happens online, I don't get this error with the offline edits, even after syncing.

There was an error applying feature edits: TypeError: undefined is not

a function (evaluating

'this.app.featureSetManager.findFeaturesByEsriFeature(a.editedFeat

ure||a.originalFeature);)

Please advise