I received word from Microsoft about this issue. Unfortunately, there's no date yet, but they said:
Product team is working on high priority to get the issue fixed soon.
I will keep you updated.
I have a button that does all 3, so I believe the Edit, New and ResetForm functions are all malfunctioning.
I have two miscrosoft accounts in my org, so i triggered the error when I transferred my working app from one environment, to the next as a brand new application. Good thing I checked the board right away! I was about to spend hours trying to troubleshoot this.
If i find a quick work around i'll respond. (I dont think changing your functions to Patch is the sexiest idea tbh, so Ill have that be my last resort).
When I moved my button out of its DataCard and pasted it on the main screen the function worked again. Pasted the same button into a DataCard in my form... error returned. Same happened with an icon.
Hope this info helps.
Same issue for me... and bad luck, the customer is testing many of my powerapps list forms... Snif.. think I hate recent powerapps updates: issues with requestHide, now SubmitForm.. next week, another regression? QA required please
Just wanted to add that I'm also running into the same issue with the SubmitForm. Other functions that also worked previously in version 3.19061.14 (Patch and Running a Manually Triggered Flow) are also affected due to a mix of the variables being changed. For example, the "Modified" field is no longer there, it may have been replaced with "Updated"? This is a PowerApps with a SharePoint List.