Allow custom value for multiple select (#14839)

src/components/ha-selector/ha-selector-select.ts

@@ -118,9 +118,11 @@ export class HaSelectSelector extends LitElement {
           .disabled=${this.disabled}
           .required=${this.required && !value.length}
           .value=${this._filter}
+          .items=${options}
           .filteredItems=${options.filter(
             (option) => !option.disabled && !value?.includes(option.value)
           )}
+          .allowCustomValue=${this.selector.select.custom_value ?? false}
           @filter-changed=${this._filterChanged}
           @value-changed=${this._comboBoxValueChanged}
         ></ha-combo-box>