pester fails to remove function

foo.tests.ps1

InModuleScope Pester {

    [System.Diagnostics.CodeAnalysis.SuppressMessage('PSUseDeclaredVarsMoreThanAssigments', '', Scope = '*', Target = 'SuppressImportModule')]
    $SuppressImportModule = $true
    . $PSScriptRoot\Shared.ps1
   
    Describe 'Function-Name' {
        Context "asdf" {
          It "breaks" {
            Write-Debug "abc"
          }
        }
    }
}

shared.ps1

Mock "Write-Debug" {
    MockedDebug $Message
}

function MockedDebug {
    [System.Diagnostics.CodeAnalysis.SuppressMessage('PSAvoidUsingWriteHost', '')]
    [CmdletBinding()]
    param(
        $Message
    )
    if ($ShowDebugText) {
        Write-Host "       [DEBUG] $Message" -ForegroundColor Yellow
    }
}