The new tiny embed creates links like
/filter/echo360tiny/lti_launch.php?
The atto embed creates links like
/filter/echo360/lti_launch.php?
Moodle filters run over the edited content to alter it for presentation-- why do the different editor embeds create different links? There should be no need for a separate tiny filter.
When moodle transitions to tiny, we weill have to keep both filters active to handle embeds on old and new text -- it would be cleaner to just have one.