0.17-savefile additional uint8

[asdff45]

Hi,
in the saves for the 0.17 version, an addition uint8 got added after the Version and before the campeign string. For what is that used for?

[asdff45]

I think it is something appended to the Version. So it is not only major, minor, patch and develop number.
It got also added after the Version in the mod-settings.dat