Cannot delete dataless localsnapshot in high sierra I use macOS high sierra 10.13.6. I have problem with freezing standby resume. I read that dataless localsnapshot may be the cause. So I proceed to delete the dataless localsnapshot. 

$ tmutil listlocalsnapshots /
com.apple.TimeMachine.2019-10-10-170247 (dataless)
com.apple.TimeMachine.2019-10-17-201830


then

$ sudo tmutil deletelocalsnapshots 2019-10-10-170247
Deleted local snapshot '2019-10-10-170247'


However, the dataless is not removed.

$ tmutil listlocalsnapshots /
com.apple.TimeMachine.2019-10-10-170247 (dataless)
com.apple.TimeMachine.2019-10-17-201830


How do I force delete the snapshot? I have tried booting into safe mode, but same result.

Update:

I am turning FileVault on. Encryption is in progress..
After encryption has been finished, I can successfully delete the dataless local snapshot. I think local snapshots can't be modified while encryption is in progress.