When Duplicating IOBoxes, the settings follow, but are not activated.
step one, make a spread with more than 5 slices (Only tested with Float32).
Then make a connection to a pad and adjust to see all slices:
Then duplicate the just created pad with extra slices and connect it to the same original spread. Now only the first 5 slices are shown, even though that you can see that it is set to the correct number of slices. Changing the Maximum Visible Entries to something else and back makes it work as expected.
EDIT: This behavior is seen in Preview 2021.4.10-1016