It seems that using the "PowerShell Session" highlighter won't pick up multiline constructs, and renders anything after the first line as output.

For instance:

PS> python -m doctest `
> -o DONT_ACCEPT_TRUE_FOR_1 `
> -o ELLIPSIS options.txt

Renders like this in https://pygments.org/demo/

I initially thought it might be the backtick as the line continuation character, but it seems that any multiline construct is not picked up properly, for example:

PS>  $Params = @{
>     Height = 50
>     Width  = 50
>     Depth  = 50
>     Name   = 'My Widget'
>     ID     = '10dbe43f-0269-48b8-96cb-447a755add55'
> }

Or

PS>  ls |
> grep "python"

On my command line emulator (Windows Terminal), it looks something like this with PowerShell Core:

On the old Windows PowerShell, with conhost.exe, it looks like this: