Django 4.1 and autocomplete not working anymore on through tables fields

[superedo73]

Hello, I've just upgraded from Django 4.0 to 4.1 and it seems that autocomplete in many-to-many nested inlines with through tables (w/extra fields) stopped working properly.
Other autocompletes (non M2M w/through tables) seems working as before.

In 4.0 all worked like a charm but now I have only an ordinary select rendered, without any select2 hook...

<select name="testo_set-0-testo2documento_set-0-documento" id="id_testo_set-0-testo2documento_set-0-documento" class="admin-autocomplete" data-ajax--cache="true" data-ajax--delay="250" data-ajax--type="GET" data-ajax--url="/admin/autocomplete/" data-app-label="bancadati" data-model-name="testo2documento" data-field-name="documento" data-theme="admin-autocomplete" data-allow-clear="false" data-placeholder="" lang="it"> </select>

whereas before I've had a proper select2 with ajax, like

<select name="prossimo" id="id_prossimo" class="admin-autocomplete select2-hidden-accessible" data-ajax--cache="true" data-ajax--delay="250" data-ajax--type="GET" data-ajax--url="/admin/autocomplete/" data-app-label="bancadati" data-model-name="documento" data-field-name="prossimo" data-theme="admin-autocomplete" data-allow-clear="true" data-placeholder="" lang="it" data-select2-id="id_prossimo" tabindex="-1" aria-hidden="true"><option value="" data-select2-id="5"></option></select> <span class="select2 select2-container select2-container--admin-autocomplete" dir="ltr" data-select2-id="4" style="width: 758px;"><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-id_prossimo-container"><span class="select2-selection__rendered" id="select2-id_prossimo-container" role="textbox" aria-readonly="true"><span class="select2-selection__placeholder"></span></span><span class="select2-selection__arrow" role="presentation"><b role="presentation"></b></span></span></span><span class="dropdown-wrapper" aria-hidden="true"></span></span>

Thank you in advance
EG

[emfrigo]

I have the same issue.