Queries Metadata bug

After trying to clear out all the query statements I now get an error message as follows. I need to do this in order to use a variation of a pbix file as a report to connect the parent dataset. (And SQLDUMPER.EXE flashes onscreen briefly)

I am using March 2020 version 2.79.5768.1082 but this existed in an earlier March 2020 version too.

It seems to have started occuring as a result of the addition of a calculated table in a recent version of the pbix file.

However, if I use an older version (from February 2020) when there wasn't a calculated table there, it still produces the same error. 

I then uninstalled Power BI Desktop and reinstalled with the latest version (per above). Still get the same error.

UPDATE 16.5.20: there's a fix in the May edition for this, and a workaround now. See my post here:
https://community.powerbi.com/t5/Issues/Bug-in-Desktop-Version-2-79-5768-721-64-bit-mars-2020-Error-when/idc-p/1091529#M56861