The enhanced UI provides a nice way of selecting multiple terms. When populating a multi-select field with a taxonomy, I am able to select one after another, the terms are shown in the UI as separate "tags".
However, saving the form only saves the first selected term, the other terms are lost.
Using the text input field with enhanced UI on the same taxonomy surprisingly works as expected (I use an additional text input field for the "add new" function of my custom taxonomy).
Am I missing a setting or something? While the text input field has a "save to taxonomy" checkbox, the multi-select doesn't, I assume it is because you can't input new values.