This is a very interesting question, as how you define ‘accidentally’ directly impacts the answer.
Under existing US law, citizenship can only be renounced by an adult who engages in a “voluntary” act of renunciation.
For example, dual citizens have a legal and constitutional right to run for political office and to hold political office in both of the countries they have citizenship in.
Yet, under US law, holding a political office in a foreign country can be an act of renouncing US citizenship.
If you did not know that prior to running for the office, you could consider that an accidental renunciation, but nevertheless, it is an act that you voluntarily engaged in.
However, it must be emphasized, that Astons cannot provide any such legal advice or guidance in the area of what does constitute or won’t constitute an act of renunciation for any nationality.