I had the same thing happen with an AW 17670 in a G2X. 0 volts.
A general rule of thumb when designing protection equipment, may it be a machine stop or over/under current protection, there are usually laws that regulate what should happen if the safety function is "broken". Those usually say that the desired outcome should be the same as if the safety function was activated. So if/when the protection circuit is destroyed for some reason, if designed correctly, it should disable the cell, to protect it.
But this is mostly a guess since I have not checked the CE/UL standards for protection circuits.
Here is some reading from Varta: https://www.varta-storage.com/wp-content/uploads/2017/07/TA_Large_Lithium_Batteries_en.pdf
Going through parts of IEC 62133 it is hard to find anything specific, it mostly states that the cell should be rendered safe after a "worst case" scenario, I understand that as the cell is going to be non functioning to prevent the user to over-charge or discharge it and harm the user or 3rd party.
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