Can't search using get-azresourcegroup based on tag existing or not

Question

I need to search on resource groups using Azure powershell cmdlets, but the examples given suggesting something like:

Get-AzResourceGroup | where {$_.Tags.Count -gt 0 -and $_.Tags.Name -contains "AutoShutdownSchedule"}

but the above returns nothing, even though I've manually checked in the portal that the tag value is there. If I run the command without the Where clause it returns all resource groups, including the one with the desired tag value.

Answer 1

I've now found a workaround by using search-azgraph but want to know if my issue is a known bug,