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Trying to manage Analysis Services Cube Data Source connections via SSMS 20.2.30.0 fails with error "tree node should not be null in DropDownTreeView::GetNodeId Parameter name: node" when I click on the three dots to the right side of the Connection String of the Data Source Properties but this works fine in SSMS 18.12 against SQL Server/Analysis Services 2019.
This is definitely a bug in the new SSMS 20.2.30 version as SSAS data sources cannot be managed via SSMS Analysis Services due to above error that does not occur when using SSMS 18.12 or 19.3 against the same Analysis Services Server + databases.