IronmanPowerShellHost Should be updated to support Coalesce (and other more recent features).
Script development, that is worth (complicated enough) Promoting to an exe, uses such features.
We use (For example):
Coalesce
$Collection | ForEach-Object -Parallel $ScriptBlock -ThrottleLimit $ThrottleLimit
Product: PowerShell Universal
If you add PowerShell 7 to the system you can choose that as your host. I have my PowerShell 7 set to auto-update and PSU always picks up the updates without issues.