`ui:title` from `ui:definitions` not applied to `oneOf`/`anyOf` dropdowns beyond first recursion level

[adamrimon]

Prerequisites

• I have searched the existing issues
• I understand that providing a SSCCE example is tremendously useful to the maintainers.
• I have read the documentation

What theme are you using?

other

Version

6.4.1

Current Behavior

When using ui:definitions with ui:title on a recursive oneOf/anyOf schema, dropdown labels show the defined title at the first level but fall back to "Option N" at deeper levels. Other UI settings like ui:placeholder work at all depths.

Expected Behavior

Dropdown labels from ui:definitions should appear at all recursion depths.

Steps To Reproduce

1. Define a recursive schema with oneOf: [{ type: 'null' }, { $ref: '#/definitions/node' }]
2. Set 'ui:title': 'Node' in ui:definitions for #/definitions/node
3. Add items at depth 2+
4. Dropdown shows "Node" at depth 1 but "Option 2" at depth 2+

Anything else?

ui:definitions was introduced in #4947 and a recursion fix was added in #4967. The recursion fix enabled property-level UI at all depths, but dropdown labels were missed because MultiSchemaField reads them from the parent-level uiSchema.oneOf[i] before any child field resolves its own definition.