As far as I know, PowerShell v2 was recently declared deprecated.
Thus, it normal to expect some kind of related errors in the latest v6.

The behaviour is strange, though. If I try to invoke something (anything
actually, including gibberish) with -version 2 then PowerShell succeeds
($LASTEXITCODE is 0) and prints the same result powershell v6.0.0-beta.7.

Steps to reproduce

    powershell -version 2 gibberish
    $LASTEXITCODE

Expected behavior

Non-zero $LASTEXITCODE and a clear error message.

Actual behavior

Zero $LASTEXITCODE and some version-like text, the same regardless of a command.

    powershell v6.0.0-beta.7
    0

Environment data

PowerShell-6.0.0-beta.7-win-x64.zip

Name                           Value
----                           -----
PSVersion                      6.0.0-beta
PSEdition                      Core
GitCommitId                    v6.0.0-beta.7
OS                             Microsoft Windows 10.0.10586
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0