Unable to remove reusable data source from report

Hi, I'm using Looker Studio Pro. 

I have a report that is currently using a "Reusable" data source, however I want to convert the report to using an embedded version of this data. 

I've added the same data source as an "Embedded" data source and updated my charts to reference this new data source. When I try to remove the old "Reusable" data source it seems to initially work, but if I refresh the page the data source is still present in my "Data sources" table, but appears "broken" with the status "Problems with the connection". Nothing I do seems to fix this issue, including trying to remove the data source from the report from the Looker Data Sources page. 

It also seems to be causing problems with the report itself, as I'm unable to re-connect the embedded data fields to the chart that had been using the reusable one. 

Please advise. 

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