Hi !
the  matrix_fieldtype/content_edit_form_fields.html.twig template had this modification :

• <input type="checkbox" class="ez-table__ezmatrix-entry-checkbox">
  + <input type="checkbox" class="ez-input ez-input--checkbox ez-ez-table__ezmatrix-entry-checkbox">
  but the javascript still search for :
  const SELECTOR_MATRIX_ENTRY_CHECKBOX = '.ez-table__ezmatrix-entry-checkbox';
  It seems to have an extra  'ez-'    ( *ez-*ez-table__ezmatrix-entry-checkbox )
  The result is that we can't detete selected rows, because the trigger supposed to enabled the delete button is never called !
   
  To reproduce :
    # create a content type with an ezmatrix field

1. create a new content
2. add a row to the ezmatrix field, select the row
3. the delete button will not be enabled