Why are the Windows files properties inconsistent between FLAC and mp3?

[Stooz]

Environment: dBpoweramp Reference Release 16.4 [64-bit] (trial) on Windows 10 Home.
Application: CD Ripper.

Here's an example:

Rip to: Multi Encoder [FLAC and mp3 (Lame)].
Compilation checkbox: Checked.
Disc text box: 2/2

Both rips set the dBpoweramp properties:
Compilation: 1
Disc: 2/2

The Windows files properties however, are set to:
Compilation - FLAC setting: <blank> mp3 setting: Yes
Part of set - FLAC setting: 2 mp3 setting: 2/2

There's an inconsistency here, the mp3 rip settings appear to reflect the dBpoweramp settings, with "Part of Set" taking on the value from "Disc".

Both types of generated files have the Windows Disc property set to <blank>.

I don't know whether or not the Windows Disc property should be set, but are the other 2 properties set differently by design, or is it that this has just never been noticed before?

[Spoon]

Re: Why are the Windows files properties inconsistent between FLAC and mp3?

>The Windows files properties however

This is Microsofts code which is reading the compilation tag, it could be that Microsoft cannot read and display this value, try in a well used player such as 'foobar2000' to see if it can read the compilation tag.