Custom number format fails on chart axis and data labels

A measure with custom format eg $#,##0,,.M shows correctly in a table visual and in tooltips.

But the built-in chart visuals make a mess of it when Display Units kick in (Auto or specified) - every axis label and data label are shown as $0MM (when the values are in Millions). It's unusable.

Seriously - they never tested any value above 1,000?

Affects Power BI Desktop (July build because August is unusable) and Power BI Web service consumer view.

Here's a simple repro:
https://1drv.ms/u/s!AmLFDsG7h6JPh4g7m6kvoejztZ27Jg?e=ymRFKf