Serious Question: How will bitcon's volatility interact with ETF pricing and stock market circuit breakers?

As I understand it, a stock that trades down (or up?) more than 20% is halted for the day. What will happen to bitcoin ETFs if the bitcoin price drops enough to trigger a cirtuit breaker, but doesn't rebound for a few days or weeks? What if it goes up more than 20% one day, then back down the next? Will the ETFs just not be tradable? Has this ever happened in other commodity ETFs?