Just upgraded to 1.8 - on 10.3
Reports > status page,
admin/config/content/formats/manage/basic_html?destination=/admin/config/content/formats
gave - website encountered a problem,
Uncaught PHP Exception ArgumentCountError: "Too few arguments to function Drupal\embed\EmbedType\EmbedTypeBase::__construct(), 3 passed in .../public_html/modules/contrib/entity_embed/src/Plugin/EmbedType/Entity.php on line 56 and exactly 4 expected" at .../modules/contrib/embed/src/EmbedType/EmbedTypeBase.php line 29
Rolled back to 1.7 - pages load again
also lost embeds on my videos, but could recover by rerunning a migrate script.
I saw the 10.2 issue, it breaks 10.3 too
Fixed
1.8
User interface
I backed out the commit in 1.8 ( 📌 Automated Drupal 11 compatibility fixes for embed Needs review ) that broke everything and released 1.9. Whoops!
Automatically closed - issue fixed for 2 weeks with no activity.