I am currently facing the same problem, but the problem occurs when the filter is marked as Required, what is the solution for this problem??
🐛 | Drupal core | Deprecated function: strlen(): Passing null to parameter #1 ($string) of type string is deprecated in Drupal\field_ui\Form\FieldStorageAddForm->buildForm()
after applying the patch "3344033-4.patch" the site crashed while adding the taxonomy term field and vocabulary, so I updated the patch.