I believe we can fix this issue by providing, via the JS, default direction value based on current page direction. Please see the enclosed patch.
These daye we are upgrading the Bar-Ilan University multiple department websites from CKEeditor 4 to ckeditor5
Most of our department websites needs that the bidi plugin will work on pages in both directions since usually Hebrew and English is enabled on same website.
Currently the module is not working as expected on the RTL pages because the default language is defaults to LTR.
In the enclosed patch the default direction is set dynamicly according to the current document/page direction.
This problem also exists in Drupal 9.
I created a patch against 9.5.x based on 2 files from Drupal 11 commits in gitlab
This patch allowed me to add working exposed filter out of entity reference field that references content (nodes).
The probleme does not exist when the field references taxonomy terms.
The views filter should be of type "field_name as a Reference filter"