Unit don't change on Composite Type

For fix this issue, you must change PropertyView.targetUpdated() and change this line let targetValue = this.getTargetValue({ ignoreDefault: 1 }); by this one let targetValue = this.getTargetValue({ ignoreDefault: 1, ignoreCustomValue: 1 });

Other fix, in PropertySelectView, you need to add setValue. When the value is !important, the input.val is set to 'value !important' and the select is empty

/**
   * Update the element input.
   * Usually the value is a result of `model.getFullValue()`
   * @param {String} value The value from the model
   * */
  setValue: function setValue(value) {
    var model = this.model;
    var val = (0, _underscore.isUndefined)(value) ? model.getDefaultValue() : value;
    var input = this.getInputEl();
    if (typeof val === 'string')
      val = val.replace(' !important', '').trim();
    input && (input.value = val);
  },

Thanks @WebEtSolutions I'm not totally sure about the solution but the bug is confirmed