Function foo{
    [CmdletBinding()]
    Param(
    [Parameter(ValueFromPipeline, ValueFromPipelineByPropertyName)]
    [array]$path
    #[string[]]$path    #I tried this too, same issue as above.
    )

    Begin{"---begin---" ; $path}
    Process{"---Process---" ; $path}
    End{"---End---" ; $path}
    }

without the pipeline, multiple values passed to the path parameter are always seen as a multi line string, foo -path 'C:tempgreen', 'C:tempblue', 'C:tempred':

---begin---
red
blue
green
---Process---
red
blue
green
---End---
red
blue
green

with the pipeline, values to path are correctly treated as array elements, foo -path 'red', 'blue', 'green':

---begin---
---Process---
red
---Process---
blue
---Process---
green
---End---
green

I dont understand this sudden change of behaviour, I am expect both instances of invoking foo (with or without pipeline) to output values to path as single array elements.

win11/pwsh 7.4