I have surveyors that were working offline on field maps yesterday, and they have noticed that the point data they collected after midday has shifted ~125m northwest.
We had this issue a few months back when ESRI updated AGOL but failed to implement the OSTN transformations for british national grid. I have asked ESRIUK to check if this is also the case this time.
Oddly, the shift doesn't occur on polygons, and im unsure about polylines.
This issue is likely only going to affect users that worked offline with their field maps. The shift is evident once the field worker has synced their work, and it still remains in the correct location in the offline map on Field Maps.
David
..Maps with no limits..