Hi, I have made a custom section in the product and category edit pages...
In it I have a button which has a javascript ajax function which calls a controller action which returns a partial view and the model of a modal, which hosts a nop-select input. When the modal is launched for the first time everything works well. But when the modal is closed and opened for the second time, the nop-select element loses all styling, it previously had, so it's basically just the raw html multiselect...
Below is my View (where I start the modal shell):

<!-- Modal -->
<div class="modal fade" id="addAssignedBlocksModal" tabindex="-1" role="dialog" aria-labelledby="addAssignedBlocksModalLabel" aria-hidden="true">
  <div class="modal-dialog modal-dialog-centered" role="document">
    <div class="modal-content">
      <!-- Content will be loaded here -->
    </div>
  </div>
</div>

Below is my modal code:

@model DetailViewExtensionPopupModel

<div class="modal-content">
  <div class="modal-header">
    <h5 class="modal-title">@T("Plugins.WeatherPriceChanger.DetailViewExtension.Modal.Title")</h5>
    <button type="button" class="close" data-dismiss="modal" aria-label="Close">
      <span aria-hidden="true">&times;</span>
    </button>
  </div>
  <div class="modal-body">
    <nop-select asp-for="SelectedBlockIds" asp-items="Model.AvailableBlocks" asp-multiple="true" />
  </div>
  <div class="modal-footer">
    <button type="button" class="btn btn-secondary" data-dismiss="modal">
      <i class="fa fa-times"></i>
      Cancel
    </button>
    <button type="button" class="btn btn-primary" id="saveAssignedBlocksButton" data-url='@Url.Action("SaveAssignedBlocks", "DetailView")'>
      <i class="far fa-save"></i>
      Save
    </button>
  </div>
</div>