We have a custom implementation for handling video, in which we extend BlockEmbed and provide a custom implementation, which is then registered for "formats/video". This results in a warning being printed to the console.
Steps for Reproduction
Expected behavior:
To not see a warning from Quill about overriding a format
Actual behavior:
A warning, see below, is printed.

Platforms:
Latest stable Chrome and Safari.
Version:
1.3.6
One fix we discovered for this was to change the Quill debug setting:
Quill.debug('error')
Changing the level to error will suppress warnings like this one.
Most helpful comment
One fix we discovered for this was to change the Quill debug setting:
Quill.debug('error')Changing the level to
errorwill suppress warnings like this one.