Deleted last series still visible in chart #63466

What is the bug or the crash?

In print layout, add a chart item and properly configure a series
Then delete it, you get a "missing chart data" label, but your previous plot is still visible until you start adding a new series. You can even modify its properties (symbols, colors, axes) and the changes are updated in the chart item.

Steps to reproduce the issue

see above

Versions

QGIS 3.99 2e07d98

Supported QGIS version

• I'm running a supported QGIS version according to the roadmap.

New profile

• I tried with a new QGIS profile

Additional context

No response