Just to clarify, I reproduced the steps you mentioned and set Amazon as the search mode and then used New Tab Page search to input a string, Amazon wasn't cleared from the address bar and the search mode was not reset. However, we're expecting search mode to be reset and Amazon to be cleared, correct?
Bug 1767615 Comment 1 Edit History
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Just to clarify, I reproduced the steps you mentioned and set Amazon as the search mode and then used New Tab Page search to input a string, Amazon wasn't cleared from the address bar and the search mode was not reset. However, we're expecting search mode to be reset and Amazon to be cleared, correct? It does seems strange to have the search box on the new tab page say one thing but then operate differently. Added `blocked-ux` tag just because it'd be good to confirm with UX that clearing the search mode is the best solution here.