PowerBI Gannt tooltip shows UK dates in app.powerbi.com but US dates in modern sharepoint webpart

As subject suggests, UK dates (dd/mm/yyyy) showing as I want on the PowerBI desktop and PowerBI online version of my gannt chart tooltip. However, when I add the report to SharePoint webpart the tooltip becomes US dates (mm/dd/yyyy).

My Regional Locale on my SharePoint site is set to UK so that shouldn't be the issue. Anyone enountered this and got a solution or workaround?

On PowerBI online:

vs

On SharePoint webpage:

SharePoint locale settings for the site:

Local computer regional settings: