Content language negotiation not working for entity autocomplete

Attached patch against Drupal 10.1.x

patch #25 doesn't apply on drupal 10.1.x and throws this error

Checking patch core/modules/language/src/Plugin/LanguageNegotiation/LanguageNegotiationContentEntity.php...
error: while searching for:
    // url.

    // First, check if processing conditions are met.
    if (!($request && !empty($options['route']) && $this->hasLowerLanguageNegotiationWeight() && $this->meetsContentEntityRoutesCondition($options['route'], $request))) {
      return $path;
    }


error: patch failed: core/modules/language/src/Plugin/LanguageNegotiation/LanguageNegotiationContentEntity.php:105
error: core/modules/language/src/Plugin/LanguageNegotiation/LanguageNegotiationContentEntity.php: patch does not apply

adding a new patch to fix CCF on #28, adding interdiff and reroll diff. please review

NW for the test failure and also #24.

The patch of #29 didn't apply to Drupal 10.2. So, I've updated the patch.

I've removed the proposed changes in the FormElement class, as they have already been added to Drupal (10.2).

The points made by #2863308-24: Content language negotiation not working for entity autocomplete → must still be addressed.