Oh, sorry @davincim I missed the link you shared. Looking at the logs, it looks like flashing and verification succeeds, but there is an issue unmounting the device. Searching the forums and on etcher issues, there have been some reports about conflicts with the same error and the main suspect seems to be the OS creating some system information files while the verification/unmounting process happens which lead it to fail.
Here is the relevant issue Lock the drive to prevent failure on verification · Issue #3197 · balena-io/etcher · GitHub
Could try the steps indicated on this post to see if they help fix the problem Flash failed on umbrel-os-v0.3.8 - #7 by tmigone?
In any case given the logs you shared, you should be OK to use the drive, since verification shows 100%.