Sollution. Whitelist or blacklist for rel, CKEditor 5, no rel="", rel without icons.

Patch made with AI.
Tested with https://www.drupal.org/project/elf/releases/8.x-1.x-dev that updated 30 Aug 2024 at 19:49

What the patch does:

1. Adds support for CKEditor 5. Taken from here: https://www.drupal.org/project/elf/issues/3311062.
2. Adds a whitelist or blacklist for rel attributes. The idea is taken from https://www.drupal.org/project/nofollowlist.
3. No more empty rel=""
4. The settings of icons and rel attributes are independent of each other.

Important!

You must disable the module before patching. Then patch and enable it.

Result: