DataPlotly graphs disappear from QGIS print layouts

[cesare710]

Describe the bug
I refer to DataPlotly graphs into a Print Layout.
When DataPlotly plugin is not active for some reason, DataPlotly graphs disappear from Print Layouts.
If I reactivate DataPlotly plugin, DataPlotly graphs don't reapper on Print Layouts.

To Reproduce
Steps to reproduce the behavior:

1. As part of a QGIS project go to 'Print Layout'
2. Prepare a DataPlotly graph in the Print Layout
3. Save the QGIS project
4. Deactivate DataPlotly plugin
5. Close and reopen QGIS
6. Open the project and go to Print Layout
7. DataPlotly graph disappeared
8. Reactivate DataPlotly plugin doesn't solve the problem.

Screenshots
NA

Desktop (please complete the following information):

• OS: macOS High Sierra 10.13.6
• QGIS 3.34.11
• DataPlotly release 4.2.0

Additional context
NA