I've been using a flow to make a 1-field update. All of sudden, after having no issues with the flow for about a week, the flow started updating a second field called "Currency Type" with it's default value "USD" as part of the process. So I removed the default value (USD) from the item's column properties and blanked out the default value from the Update Item action to try and clean up the flow so that it would only update the filed that it was meant to update in the first place. After trying to save the flow to test it out, I started getting Flow Checker errors warning me that there were some required fields that needed to be updated as part of the action. Why would I be required to update other fields if I just want to use the Update Item action to update one specific field? Is there a way to get around this?
Also note that this flow is taking action against a SharePoint list with version control enabled, so I'm trying to avoid having the flow update columns that should be restricted to updates/changes made by the users only.

