System Information
Operating system: macOS-11.6.4-x86_64-i386-64bit 64 Bits
Graphics card: AMD Radeon Pro 560X OpenGL Engine ATI Technologies Inc. 4.1 ATI-4.6.21
Blender Version
Broken: version: 3.2.0, branch: master, commit date: 2022-06-08 10:22, hash: rBe05e1e369187
Worked: don't know
Short description of error
Even with "is library overridable" checked, a linked object's custom property is not editable.
Exact steps for others to reproduce the error
Open the attached file, select the cube and in the object properties tab note that the custom property "prop" has "is library overridable" checked.
Close the file, open a new file, and link the sphere from the attached file, select the sphere and do "object > relations > make library override".
In the N panel with the sphere selected pick the item tab and open the properties dropdown,
Note that the "prop" property is greyed out and any attempt to edit it results in a "disabled ..." popup.