If you place a field using Layout Builder and try to give it a delimiter, your setting is ignored. This is related to #3061187: #view_mode is always "_custom" in HOOK_preprocess_field() with layout_builder enabled → .
A fix here looks like this:
$view_mode = $element['#view_mode'];
// Add a check for Layout Builder alternative settings.
if ($view_mode == '_custom') {
$view_mode = $element['#third_party_settings']['layout_builder']['view_mode'];
}
Note that this fix will only work in Drupal 8.8+, in earlier versions it's just broken.
Needs work
2.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
The fix (patch) in comment #4 seems to be the right approach (3099580-layout-builder-view-mode.patch), but it does not work with 2.0.x (2.0.x-dev) version.
I re-applied the patch for 2.0.x, the following line of the #4 patch had to bechanged:
- FROM: $view_mode = $element['#third_party_settings']['layout_builder']['view_mode'];
- TO: $view_mode = $variables['element']['#third_party_settings']['layout_builder']['view_mode'];