I have a document library, that has two content types on SP 2016
Custom is set as the default content type, as well as the only available content type, using Mange Content type.
If I upload a particular document, it uses the OOTB content type.
If I fix the document using File > Info > Check for issues > Check for issues and remove "Document properties and Personal information" & "Custom XML data" the custom content type is used.
Anyone experienced anything like this. Any way to avoid saving the OOTB content type and always save custom content type