Discovery in Pester v5 does not run everything twice

discovery of expensive test.ps1

Get-Module Pester | Remove-Module
Import-Module ./Pester.psd1

$sb = {
    Add-Dependency {
       Start-Sleep -Seconds 10
    }

    Describe "integration test" {

        BeforeAll {
            Start-Sleep -Seconds 10
        }

        It "test 1" {
            Start-Sleep -Seconds 10
        }

        It "test 2" {
            Start-Sleep -Seconds 10
        }
    }
}
$ss = $ExecutionContext.SessionState

# invoking internal pester function
# because the Find function is not 
# published (yet)
(Measure-Command {
    &(Get-Module Pester) {
        param ($SessionState, $ScriptBlock) 
        $container =  New-BlockContainerObject -ScriptBlock $ScriptBlock
        Find-Test -BlockContainer $container -SessionState $SessionState
    } -SessionState $ss -ScriptBlock $sb 
}).TotalMilliseconds