Based on my test, there is no prefix 0 in the percentage values both in reports and dashboards. In your scenario, which data source you were connecting to? Did any person modify the reports or dashboards recently? Was there any update on data source side? Please share more detail information with us so that we can try to reproduce the issue.
Also you can create a simple report in Power BI Desktop, drag a chart or card into the report to display a measure which calculate percentage values(##.##% format ). Then publish it to service to check if 0 is prefixed.
Community Support Team _ Xiaoxin If this post helps, please consider accept as solution to help other members find it more quickly.
I am using the French localization of power BI too, and I am facing now the same issue.
I have just switched from the july version of power BI to the august version (2.38.4491.282 64-bit) without changing the data nor the reports.
Sometimes, the percentages are displayed without leading 0.
For the chart on the right hand side, if I change the format with no decimals (integer), the percentages loose their leading 0, even the 7% line. If I get back to 1 decimal, the leading 0 are back too.
@rickenbroc, @YuanG, thanks for reporting this issue. It can be reproduced on my side in the French Power BI Desktop. I will report it internally to ask senior engineers to have a check. Will post back for any updates.