When creating a content type with an ibexa_seo field, the created content type has two ibexa_seo fields.

To reproduce:

cp vendor/ibexa/seo/tests/integration/Resources/Migrations/snapshots/input_content_type_with_seo_field.yaml src/Migrations/Ibexa/migrations/;
php bin/console ibexa:migrations:migrate --file=input_content_type_with_seo_field.yaml;

Then, take a look at the content type in the BO, and edit it. There is two ibexa_seo fields, one with the identifier seo_field, one with a random identifier such as field_653146188859c.