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Hi Phil,
I think this has been fixed in the current beta build of Excel. You can wait till mid-July for this fix to be deployed in the monthly update, providing beta testers agree the bug has been fixed.
If you wish to beta test and let Microsoft know whether or not the bug is fixed to your satisfaction, join the insider program.
https://insider.office.com/en-us/
To send feedback within the Insider program, from the Menu Bar in Excel choose Help > Contact Support or a Feedback option.