DESCRIBE PAGE omits Attribute (association) and CaptionAttribute of a combobox in association mode

[kaspergff]

Environment: mxcli nightly-20260927-95091765 (2026-09-27T08:03:29Z), Mendix 11.12.1, Windows 11.

Summary: describe page omits the association binding of a combobox in association mode. Attribute: (the association) and CaptionAttribute: are missing from the output, although both are in the BSON. Re-executing the DESCRIBE output writes an unbound combobox, silently.

Steps to reproduce

1. Domain model: MyModule.Order with a reference MyModule.Order_Customer to MyModule.Customer (attribute Name).
2. In Studio Pro, on a page with a data view over Order, add a Combo box bound to association Order_Customer, caption attribute Name, selectable objects from a database source with an XPath constraint, and an On change microflow.
3. mxcli describe page MyModule.Order_Edit

Actual

combobox comboBox1 (Label: 'Customer', DataSource: database from MyModule.Customer where [Active = true] sort by Name asc, OnChange: microflow MyModule.ACT_Order_CustomerChanged, DesignProperties: [...])

No Attribute: and no CaptionAttribute:. mxcli bson dump --type page shows both the association and the caption attribute.

Expected

combobox comboBox1 (Label: 'Customer', Attribute: Order_Customer, DataSource: database from MyModule.Customer where [Active = true] sort by Name asc, CaptionAttribute: Name, OnChange: microflow MyModule.ACT_Order_CustomerChanged, DesignProperties: [...])

Note: the write side works. Authoring exactly that form in MDL and executing it produces the correct association + caption binding (verified with bson dump). Only the reader drops it.