Parameter descriptions disappearing

Hi,

I have this issue with parameter descriptions.

The tooltips are visible in modify mode, e.g.:

but If I go in edit mode, the description field is empty:

If I connect to the .pbix file in Tabular Editor, the Description attribute of the Parameter object shows the proper text:

If I edit it, the change is saved in the 'local' copy of the datamodel in Tabular Editor, but then PBI can't save the changes in the .pbix file.

If I export the .pbix as a .pbit, then the descriptions completely disappear:

Thank you