Thanks for testing it, and sorry for the noise.
My understanding from the changelog was that backup jobs now feed into the XO Tasks panel specifically rather than the old backup task view, but I might have got that wrong, or it may not cover mirror incremental. Are you seeing anything at all in XO Tasks while the backup runs?
If the Tasks panel is also empty, then either I misread what the fix actually covers, or there's something else going on that's worth raising directly on the XO tracker.