I recently (2021-12-19) suspended and archived a member (ID 57031785). The contacts API is still returning the timestamp of the previous update (2021-06-18T10:58:17.37-07:00) for Profile Last Updated.

This invalidates any API usage that seeks to minimize server load and response time by fetching only changed records.

I believe this is a bug, and it prevents me from using the Contacts API effectively. I will have to do a full contacts dump every time I want to synchronize my local DB, and will increase the load on your server significantly, since this is done at least once a day, sometimes more than once.

If this is something you don't intend to correct, can you provide a list of which field changes cause Profile Last Updated to be set, and which don't.