Enable type conversion of AutomationNull to $null for assignment (#19415)

test/powershell/Language/Scripting/Scripting.Followup.Tests.ps1

@@ -30,6 +30,18 @@ Describe "Scripting.Followup.Tests" -Tags "CI" {
         $arraylist.Count | Should -Be 0
     }
 
+    It 'AutomationNull should be same as null for type conversion' {
+        $result = pwsh -noprofile -command {
+            class Example {
+                [string[]]$LogMessage
+            }
+
+            [Example] @{ LogMessage = [System.Management.Automation.Internal.AutomationNull]::Value }
+        }
+
+        $result.LogMessage | Should -BeNullOrEmpty
+    }
+
     ## fix https://github.com/PowerShell/PowerShell/issues/17165
     It "([bool] `$var = 42) should return the varaible value" {
         ([bool]$var = 42).GetType().FullName | Should -Be "System.Boolean"