The v21+ AB Logix driver has a setting for whether to rebrowse the PLC automatically or not.
That will only update the OPC Browser (after it is refreshed, too).
Nothing will update your Ignition tag's OPC Item Paths, nor automatically alter your Ignition UDTs.
I would be curious if you can reproduce the behavior with rebrowse turned on, and possible also with my alternate driver.
{ My driver does not have a setting--it just rechecks once per minute. }