What is the bug or the crash?

When calling the attributes form programmatically, via PyQGIS, the interface is not the same to what is in the GUI (right click on layer > Open Attribute Table).

This is the layer properties: as you can see fid is hidden and the fields a (but also b and c) has an alias.

Form in the GUI: everything is as expected.

Form when called with PyQGIS: does not care about what was set in the properties.

Steps to reproduce the issue

• Create a new project
• Create a new GeoPackage: Layer > Create Layer > New GeoPackage Layer
  • Give it a location, eg: my/test/path
  • Give it a name, eg: test
  • Add several fields to the GeoPackage, eg: a, b and c
• Change the Attributes Form:
  • In the Layers panel: Right click on the layer test > Properties
  • In the Attributes Form tab:
    • Change the type to "Drag and Drop Designer"
    • Remove fid from the right list, add aliases to the other fields (see screenshot above)
    • Save your changes, click "OK"

Check the table via the GUI:

• In the Layers panel: Right click on the layer test > Open Attribute Table
  • Click "Toggle editing mode"
  • Click "Add Feature"
• The UI should look like what you set in the properties.

Now check PyQGIS:

• In the Menu: Plugins > Python Console
• In the the console enter the following (replace my/test/path by the path you set when creating the GPKG):

  >>> layer = QgsVectorLayer("my/test/path/test.gpkg|layername=test", "test", providerLib="ogr")
  >>> iface.showAttributeTable(layer).exec_()

• A window should open:
  • Click "Toggle editing mode"
  • Click "Add Feature"
• The UI does not look the same as what you set in the properties.

Versions

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