Missing default forms for SharePoint list

Brass Contributor

I have been working super hard on a SharePoint list with a TON of different views, a custom Microsoft Form for input and a Power App flow to bring it all together.  I have SharePoint pages with List web parts built into them and when I select an item to look at the display form/item details, I receive an error saying, "unable to find the default display form."  When I dig into SharePoint Designer, I see all of my Forms are missing.  I am unable to add them back via SharePoint Designer.  I have tried adding a custom form via PowerApps but when I hit publish, nothing happens and the same error appears.  Can anyone help, please?  

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