Also Finder can not see second partition of the drive. On top of that when opening Disk Utility it loads for really long and almost freezes. Trying to mount second partition from Disk Utility does nothing. I have run First Aid, have reset PRAM, still nothing. Additionally when this happened now the Spotlight can’t find any applications either. I followed these steps, still no luck: Applications Don't Show Up in Spotlight Is my M2 SSD dying or what is happening. How could I verify that?
Also Time Machine fails to make any successful backups to external disk, complains that (previously was working fine):
An error occurred while copying files. The problem may be temporary. If the problem persists, use Disk Utility to repair your backup disk.
All this started after a MacBook restart.
I have MacBook Pro 15" from 2015 and running Mac OSX version 10.14.6