Invoke-PnPSiteScript failing with "Object reference not set to an instance of an object."

[Grendel04]

powershell/src/Commands/SiteDesigns/InvokeSiteScript.cs

Line 58 in f2894d2

result = PnP.PowerShell.Commands.Utilities.SiteTemplates.InvokeSiteScript(Connection, AccessToken, Script, hostUrl).GetAwaiter().GetResult().Items;

I thought this was something on my end, but no matter what I use for $script, I always seem to get the "Object reference" exception

If I save this script to sharepoint and use it in a Site Design, it works just fine
(Invoke-PnPSiteDesign -Identity $IdWithTestingSiteScript)

This can be replicated by using the following in powershell

$adminconn = Connect-PnPOnline -Url "https://DOMAIN-admin.sharepoint.com/" -ReturnConnection -Interactive

$script = @'
{"$schema":"https://developer.microsoft.com/json-schemas/sp/site-design-script-actions.schema.json","actions":[{"verb":"activateSPFeature""featureId":"3bae86a2-776d-499d-9db8-fa4cdc7884f8","scope": "site"}]}
'@

Invoke-PnPSiteScript -Connection $adminconn -Script $script -WebUrl "https://DOMAIN.sharepoint.com/sites/SITE"