Distribution wizard displays incorrect information when upgrading a flavor depending of another flavor

I'm in the case where I'm deploying on a subwiki, a flavor that depends on the standard subwiki flavor. When upgrading the war, and making sure that a compatible version of my custom flavor is available on the wiki, the following situation happens in the DW :

At this point, I can't use the "flavor upgrade" step of the DW to upgrade the flavor, however, clicking on "later" to go on the extension upgrade step, then clicking on "check for updates" allows me to see that a new version of my flavor is available and to upgrade it, as I would do with a standard extension.