Clearing input cancel list in Element Send Keys

Element Send Keys details the following steps:

11. Let source be the result of create an input source with input state, and "key".

12. Add an input source with input state, input id and source.

13. Dispatch actions for a string with arguments input state, input id, and source, text, and session's current browsing context.

14. Remove an input source with input state and input id.

Dispatch actions for a string then eventually dispatches keyDown actions, which in dispatch tick actions says:

If subtype is "keyDown", append a copy of action object with the subtype property changed to "keyUp" to input state’s input cancel list.

Once that is done we arrive at step 14 in Element Send Keys: Remove an input source. This says:

Assert: None of the items in input state's input cancel list has id equal to input id.

But I can't find the place in the spec where the input cancel list should be cleared: the only reference to clearing the input cancel list is in Release Actions.

Start by tracing the cited WebDriver sections: Element Send Keys, Dispatch actions for a string, dispatch tick actions, Remove an input source, and Release Actions. Compare their input cancel list requirements and determine whether the specification identifies a clearing step. Done means the specification's lifecycle is consistent and the missing behavior or assertion is explicitly resolved.