When the environment variable VSCMD_VER is set to a prerelease version such as 15.7.0-pre.4.0 (on my current internal build, but these are available externally as well), Version.TryParse fails to parse it and we fall back to VisualStudioVersion, which is stuck at 15.0. That causes the returned instance to report its version as 15.0, which may lead an upstream consumer to incorrectly reject it.
When the environment variable
VSCMD_VERis set to a prerelease version such as15.7.0-pre.4.0(on my current internal build, but these are available externally as well),Version.TryParsefails to parse it and we fall back toVisualStudioVersion, which is stuck at15.0. That causes the returned instance to report its version as15.0, which may lead an upstream consumer to incorrectly reject it.