We are trying to push the encryptionScheme of a standard "Name" field of a custom object through DX using the object-meta.xml and it didn't throw an error message but it didn't enable the Platform Encryption too.

Have any one faced this?

I tried encrypting the same by manually going to the Name field and I can do it successfully,

It works fine on the Custom fields of both Standard and Custom objects and it could push it successfully.