MultiSelectComboBox keepFilter mode behavior is not consistent

[TatuLund]

Description

Keyboard and mouse use cases with MultiSelectComboBox have different out comes when keepFilter = true.

Expected outcome

Use cases A) and B) to be the same.

Minimal reproducible example

@Route(value = "multiselect-issue", layout = MainLayout.class)
public class MultiSelectIssueView extends VerticalLayout {

	public MultiSelectIssueView() {
		setSizeFull();
		setPadding(true);
		MultiSelectComboBox<String> tagInput = new MultiSelectComboBox<>("Tags");
		var dataView = tagInput.setItems("turku", "turkmenistan", "tupolev", "turkey");
		tagInput.setAllowCustomValue(true);
		tagInput.setKeepFilter(true);
		tagInput.addCustomValueSetListener(e -> {
			var newTag = e.getDetail();
			dataView.addItem(newTag);
			var selected = new HashSet<>(tagInput.getValue());
			selected.add(newTag);
			tagInput.setValue(selected);
		});
		add(tagInput);
		tagInput.addValueChangeListener(e -> {
			Notification.show(e.getValue().stream().collect(Collectors.joining(",")));
		});
	}
}

Steps to reproduce

The sequence A)

1. type "tu" in the input
2. click Turku
3. click outside the MultiSelectComboBox

After step 2. only Turku is selectedAfter step 3. it commits "tu" as a new value and selects it

On the other hand sequence B)

1. type "tu" in the input
2. press cursor down
3. press enter, selects turku, "tu" remains as input (keep filter)
4. press tab to focus out, does not commit "tu" as new value

I would expect these to be the same. I.e. in both cases "tu" commited or not committed

Especially as if you do

1. type "tu"
2. press tab -> "tu" will be committed and selected

or

1. type "tu"
2. click outside -> "tu" will be committed and selected

Which are the same

One could claim that the first use case A) is sort of correct, although not desired in all circumstances. 

Environment

Vaadin version(s): 23.5.8, 24.4.

Browsers

No response