<button> tags are being removed from the HTML code

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I've coded an FAQ accordion using HTML, CSS and JavaScript only. Everything works as it should upon save and the user is able to click on each question to expand the answer. 


Upon editing the code again, the <button> tags are being removed and I am no longer able to click on each question to uncollapse the answer panels.


I've removed all third-party FAQ extensions that could be overriding the code. Anyone able to help me troubleshoot?