Our flow includes an "Update Record in a Feature Layer" step. Since about 19:00 13 Feb UTC, this step has been consistently failing with the following error:

while updating with data like:

The date values have been retrieved from a different table using a "Get Data from a feature layer" step.
This flow has been working for months. It is running in NZST (UTC+13:00).
The main issue is this failing step.
A secondary issue is that the step appears to succeed, with an underlying HTTP return code of 200, so we only found out about the error from our users.
Keen for any thoughts on what may have caused this or what we could try to resolve it?