Duplicate template suggestions

Sorry to necro-post, but I'm also having a similar issue as the OP. The ticket that this is marked as a duplicate seems to be about fields, not layout.

 THEME HOOK: 'layout__onecol' 
 FILE NAME SUGGESTIONS:
   x layout--onecol.html.twig
   * layout-onecol--node--2126.html.twig
   * layout-onecol--node-activity-inline-entity-form-view.html.twig
   * layout-onecol--node-activity.html.twig
   * layout-onecol--node-inline-entity-form-view.html.twig
   * layout-onecol--node.html.twig
   x layout--onecol.html.twig
   * layout.html.twig

I don't see the duplicate when I dump the variables (in my .theme file via HOOK_theme_suggestions_layout_alter:

^ array:6 [
  0 => "layout__onecol"
  1 => "layout_onecol__node"
  2 => "layout_onecol__node_inline_entity_form_view"
  3 => "layout_onecol__node_activity"
  4 => "layout_onecol__node_activity_inline_entity_form_view"
  5 => "layout_onecol__node__2126"
]

I want to use layout-onecol--node-inline-entity-form-view.html.twig but I can't because something is putting layout__onecol.html.twig back at the top of the list and its happening after the theme suggestions function so I can't override it from that end either.

Using D9.5.9.

Edit: Worked around it by switching to a DS layout where the issue didn't exist.

I still see the duplicate, but its at least at the bottom so I can override it:

 THEME HOOK: 'ds_1col' 
 FILE NAME SUGGESTIONS:
   * ds-1col--node--2126.html.twig
   x ds-1col--node-activity-inline-entity-form-view.html.twig
   * ds-1col--node-activity.html.twig
   * ds-1col--node-inline-entity-form-view.html.twig
   * ds-1col--node.html.twig
   * ds-1col.html.twig
   * ds-1col.html.twig

^ array:6 [▼
  0 => "ds_1col"
  1 => "ds_1col__node"
  2 => "ds_1col__node_inline_entity_form_view"
  3 => "ds_1col__node_activity"
  4 => "ds_1col__node_activity_inline_entity_form_view"
  5 => "ds_1col__node__2126"
]

#14: @fallenturtle I don't think that's a necro-post, you raise a valid point.

Anyone coming across this: a failing test would be a very good starting point to getting this fixed.

Drupal 10.2.6, not using Display Suite.

I have a similar issue with menus. I want to use the menu--main--sidebar-first.html.twig but it seems impossible beacause of the menu--main.html.twig duplicate at the top of the suggestions.

<!-- THEME DEBUG -->
<!-- THEME HOOK: 'menu__main' -->
<!-- FILE NAME SUGGESTIONS:
   x menu--main.html.twig
   * menu--main--sidebar-first.html.twig
   x menu--main.html.twig
   * menu.html.twig
-->