Hi,
Stop messing with vmware-vdiskmanager.. it won't fix this.
It's how you lost the disk slice in the first place.
Also fix back your -000004.vmdk file back to the original state with the missing slice.
You can't just remove a disk slice and expect things to work. It won't.
Finally ... in order to resolve:
Create a new VM with the EXACT same disk size as your current VM with problems.
It should have the same data in the .vmdk file as your -000004.vmdk.
Same amount of slices and same size. The "8323072" in your original RW 8323072 SPARSE "Windows 10 Dev-000004-s017.vmdk" line.
When that's true... take slice 17 and rename it "Windows 10 Dev-000004-s017.vmdk".
Copy it into your broken VM.
Note that there will be data loss as a whole slice has gone missing.
But with the notes above you should be able to get the VM to be recognized again.
Oh and .. yes DO MAKE A BACKUP before you start making changes and experiment.
--
Wil