Hi jphughan and GoNz0,
Thanks for bringing this to our attention.
To load drivers on startup, the rescue media uses the Drvload tool included as part of Windows PE/RE. It is possible that there is an issue with the Drvload included in Windows RE 1809 - unfortunately, Microsoft have pulled the 1809 update, so we've been struggling to find machines to test this issue on. Once Microsoft start rolling out the 1809 update again, we should be able to pin down exactly what's going on and push out a fix. In the meantime, jphughan's workaround (using the Unsupported Devices dialog) should work fine.
Andrew - Macrium Support