Re: Change Data Connection for SharePoint Update Item bug
Hi @Anonymous ,
Do you mean after the connection is updated, is the content of the field configuration in Update item action removed?
I did the test on my side, which is consistent with what you described.
Because after updating the connection, the action will get the fields contained in the list according to the configured Site Address and List Name, so the previously displayed fields will be reset, and the previously configured content will be removed.
Create item action seems to be the same.
You could try to export the Flow as a .zip file and re-import it as a new Flow.
Note that when importing, you need to replace the connection with the expected one, instead of changing it after importing.
Image reference:

Please take a try and see if it helps.
Best Regards,