This issue experiences when the resource removal is not followed as per Microsoft recommendation. You can try a force Update the resources through resources.Azure.com portal
Visit resources.Azure.com and find the resource group: Subscription Name > ResourceGroups > ResourceGroup Name. You may find it as shown below:
Select the Resource Group and click Edit
Then click PUT to forcefully update the resource group. If the resource is stuck in a deletion or updating state the operation helps to resolve the issue in most of the cases I see. Try a deletion after the above step and see if it helps!
Hope this helps.
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