Could not mount “disk1s2”. (com.apple.DiskManagement.disenter error -119930868.) - Cataline

Dears, need your help with the error -119930868, that appears during the disk physical disk mounting...

due to last update of Catalina my iMac crashed, and reinstall faces continues error. Resolution was to erase part of Fusion disk (ssd part, because hdd has all my important data) once ssd was eared hdd part of fusion drive became unmounted, Catalina was successfully installed but now I see only ssd part and my hdd is still unmounted, and got this error, if tried to mount it again, maybe you have any suggestion how to recover/fix it without erasing?

Regards,