I don’t think anyone here has made it clear which version of VLM is producing this error.
I use the VLM Windows application written by Namirda. It is still properly sending flight paths with the correct elevation to Google Earth Pro for me.
There is also a Chrome and Firefox VLM extension which is a different piece of software than the VLM Windows application. It was written by someone else.
When you say VLM has a bug, you should make it clear which VLM you are referring to. Either the browser extension or the Windows application.