(OPC UA) During Npx Object mapping the field "Type filter text or..." work not as expected

Requirement concerned:

As a User, I want the filter field in the netPROXY object mapping section to correctly display and allow interaction with the filtered objects, so that I can efficiently select and work with specific OPC UA nodes easy.

Bug description:

A bug has been identified under the section "netPROXY->Objects and Mapping". When a user attempts to filter objects using the filter field, e.g. by typing "Demo", the expected behavior of the system is to display and allow expansion of the filtered object "DemoDevice". However, currently, the system fails to display the variables/nodes below the "DemoDevice". This issue is not isolated to custom added OPC UA Nodes by users, as evidenced by the same bug occurring when searching for "ServerStatus".

Steps to reproduce:

1. Navigate to "netPROXY->Objects and Mapping".
2. Select an element to map.
3. Type "Demo" into the filter field and observe the result.
4. Note that the variables below the "DemoDevice" are not shown, contrary to the expected result where the "DemoDevice" should be expandable, allowing selection of suitable OPC UA nodes.
5. Repeat the process, this time searching for "ServerStatus" to confirm the bug's presence across different OPC UA nodes.