FYI - I found another instance of that file on another server - and the SHA256 for it is exactly the same as it is for the one on the server - with the issue.
wow64_microsoft-windows-winsrv_31bf3856ad364e35_10.0.14393.2879_none_364aa4702b7d5b59.manifest
SHA256: 2C01DF0858F31723DB4C34AE82F91FCF858EA1D1A7AFFF76F050EFFE76F3586B
So the issue isnt the file.
The Reg entry for it:
[HKEY_LOCAL_MACHINE\GOOD\DerivedData\Components\wow64_microsoft-windows-winsrv_31bf3856ad364e35_10.0.14393.2879_none_364aa4702b7d5b59]
"S256H"=hex:47,57,18,13,36,64,bf,d2,68,e7,d6,20,a4,bf,fb,32,c3,48,0b,7b,bd,ab,\
c0,9b,23,13,06,3b,dc,41,3d,32
"identity"=hex:4d,69,63,72,6f,73,6f,66,74,2d,57,69,6e,64,6f,77,73,2d,57,69,6e,\
73,72,76,2c,20,43,75,6c,74,75,72,65,3d,6e,65,75,74,72,61,6c,2c,20,56,65,72,\
73,69,6f,6e,3d,31,30,2e,30,2e,31,34,33,39,33,2e,32,38,37,39,2c,20,50,75,62,\
6c,69,63,4b,65,79,54,6f,6b,65,6e,3d,33,31,62,66,33,38,35,36,61,64,33,36,34,\
65,33,35,2c,20,50,72,6f,63,65,73,73,6f,72,41,72,63,68,69,74,65,63,74,75,72,\
65,3d,77,6f,77,36,34,2c,20,76,65,72,73,69,6f,6e,53,63,6f,70,65,3d,4e,6f,6e,\
53,78,53
Interestingly, the 'good' entry does NOT have a key resembling: c!324523452435234 etc and the identity is different.