This command is wrong, it uses a “latest” version which has unpredictable effects. Never use it on production systems, it’s just for testing purposes!
Luckily it does not really run the update because “latest” is not a Semver string 
If the migration was finished, refer to release notes of 8.3 for the commands that clear the stale Redis DB keys: Release notes — NS8 documentation
As alternative, wait the grace period of 12 hours.