You install Acronis Agent on macOS 10.13 with HFS+ on FusionDrive.
During Installation the (otherwise invisible) partitions „Recovery HD“ and „Boot X“ appear and stay visible after installation.
Acronis Agent detects file systems on all partitions of the Mac. To be able to read the file system on those hidden partitions, Acronis Agent needs to mount them and thus they become visible.
Product behavior will be improved in future versions.