Wanted to bump this, since I'm running into the same frustrations with a Dropdown component. Since the Dropdown also has the ability to enter custom text (if allowCustomOptions is enabled), I thought I'd be able to use the onCompositionEnd event if the user manually enters text to open a popup for her/him to confirm whether to add the new value to the database.
The proposed solution to filter on:
isn't as straightforward for the Dropdown, since the props.value field would also be changed by the browser when a user selects an existing option. In this case, I also need to filter out numeric values and 'null', which is what is set after clearing. I'm sure this solution will work, but just seems like kind of a kludgy workaround.
Like @rberghammer, I'd recommend either clarifying this in the documentation or fixing it so the events fire as expected.