Multiple selected_lists in nested association loop act as single select

[rg34]

Hello. Thank you so much for a GREAT library that I've used a lot! You have saved me a lot of time.

I have an application using ruby 3.1.0, rails 6.1.5 and ActiveAdmin 2.11.1, ActiveAdmin Addons 1.9.0.
I am trying to loop through a nested association in a form and one of the inputs needed is a selected_list.
Everything renders perfectly, however, when I make a selection in one dropdown, it populates every selected_list on the form. I've removed the other fields in the form to isolate the problem:

the relationship is:
Application has_many :submissions
Submission has_many :decisions
Decisions HABTM Reasons => reasons_decisions join table

@submission = application.submissions.last:

f.semantic_fields_for @submission do |fs|
  fs.semantic_fields_for :decisions do |r|
    r.inputs do
      ...
       r.input :reason_ids, as: :selected_list, label: 'Reasons', display_name: :explanation, fields: [:explanation],
              minimum_input_length: 0, url: admin_submission_reasons_url
     end
  end
end

Resulting in the following html (when there are two decisions, for example):

<fieldset class="inputs">
   <ol>
      <li class="selected_list input optional stringish" id="application_submission_decisions_attributes_0_reason_ids_input">
         <label for="application_submission_decisions_attributes_0_reason_ids" class="label">Reasons</label>
         <div class="selected-list-container">
            <div id="decision_reason_ids_selected_values" class="selected-values"><input id="decision_reason_ids_empty" name="decision[reason_ids][]" value="" autocomplete="off" type="hidden"></div>
            <select id="application_submission_decisions_attributes_0_reason_ids" class="selected-list-input select2-hidden-accessible" data-model="decision" data-method="reason_ids" data-url="http://localhost:3000/admin/applications/89/submission_reasons" data-response-root="reasons" data-fields="[&quot;explanation&quot;]" data-predicate="contains" data-display-name="explanation" data-minimum-input-length="0" data-width="100%" data-order="explanation_desc" name="application[submission][decisions_attributes][0][virtual_reason_ids_attr]" tabindex="-1" aria-hidden="true" data-select2-id="application_submission_decisions_attributes_0_reason_ids"></select><span class="select2 select2-container select2-container--default" dir="ltr" data-select2-id="9" style="width: 100%;"><span class="selection"><span class="select2-selection select2-selection--single" role="combobox" aria-haspopup="true" aria-expanded="false" tabindex="0" aria-disabled="false" aria-labelledby="select2-application_submission_decisions_attributes_0_reason_ids-container"><span class="select2-selection__rendered" id="select2-application_submission_decisions_attributes_0_reason_ids-container" role="textbox" aria-readonly="true"></span><span class="select2-selection__arrow" role="presentation"><b role="presentation"></b></span></span></span><span class="dropdown-wrapper" aria-hidden="true"></span></span>
         </div>
      </li>
   </ol>
</fieldset>
<input autocomplete="off" type="hidden" value="37" name="application[submission][decisions_attributes][0][id]" id="application_submission_decisions_attributes_0_id">
<fieldset class="inputs">
   <ol>
      <li class="selected_list input optional stringish" id="application_submission_decisions_attributes_1_reason_ids_input">
         <label for="application_submission_decisions_attributes_1_reason_ids" class="label">Reasons</label>
         <div class="selected-list-container">
            <div id="decision_reason_ids_selected_values" class="selected-values"><input id="decision_reason_ids_empty" name="decision[reason_ids][]" value="" autocomplete="off" type="hidden"></div>
            <select id="application_submission_decisions_attributes_1_reason_ids" class="selected-list-input select2-hidden-accessible" data-model="decision" data-method="reason_ids" data-url="http://localhost:3000/admin/applications/89/submission_reasons" data-response-root="reasons" data-fields="[&quot;explanation&quot;]" data-predicate="contains" data-display-name="explanation" data-minimum-input-length="0" data-width="100%" data-order="explanation_desc" name="application[submission][decisions_attributes][1][virtual_reason_ids_attr]" tabindex="-1" aria-hidden="true" data-select2-id="application_submission_decisions_attributes_1_reason_ids"></select><span class="select2 select2-container select2-container--default" dir="ltr" data-select2-id="10" style="width: 100%;"><span class="selection"><span class="select2-selection select2-selection--single" role="combobox" aria-haspopup="true" aria-expanded="false" tabindex="0" aria-disabled="false" aria-labelledby="select2-application_submission_decisions_attributes_1_reason_ids-container"><span class="select2-selection__rendered" id="select2-application_submission_decisions_attributes_1_reason_ids-container" role="textbox" aria-readonly="true"></span><span class="select2-selection__arrow" role="presentation"><b role="presentation"></b></span></span></span><span class="dropdown-wrapper" aria-hidden="true"></span></span>
         </div>
      </li>
   </ol>
</fieldset>
<input autocomplete="off" type="hidden" value="38" name="application[submission][decisions_attributes][1][id]" id="application_submission_decisions_attributes_1_id">

When I click into the search select in one input, I see that a data-select2-id gets added and then, when I click in the other search select, a unique data-select2-id gets added to that one.

And, the actual selects each have a unique id:
application_submission_decisions_attributes_0_reason_ids
application_submission_decisions_attributes_1_reason_ids

I have tried adding additional ids and classes to the inputs for uniqueness.

My permit params:

  permit_params :admin_user_id, :status,
                screenshots: [], active_admin_comments_attributes: %i[body author_id namespace resource_id resource_type author_type],
                submission: [:id, { decisions_attributes: [:id, :grade, reason_ids: []]}]

but something is definitely wonky with the nested params when I submit the form ( "decision"=>{"reason_ids"=>["", "", "60"]},)

{"_method"=>"patch",
 "authenticity_token"=>"[FILTERED]",
 "application"=>
  {"admin_user_id"=>"7",
   "status"=>"new",
   "current_admin_user_id"=>"1",
   "active_admin_comments_attributes"=>{"0"=>{"body"=>"", "author_id"=>"1", "namespace"=>"admin", "author_type"=>"AdminUser", "resource_type"=>"Application", "resource_id"=>"89"}},
   "submission"=>{"decisions_attributes"=>{"0"=>{"id"=>"37"}, "1"=>{"id"=>"38"}}}},
 "decision"=>{"reason_ids"=>["", "", "60"]},
 "commit"=>"Update Application",
 "id"=>"89"}

THANK YOU for any guidance on what I am doing wrong here. It's SO close to working, I don't want to give up!
I've tried with a search_select and do not have the same problem, but I really need the list.