I know there are also some laws on evicting within a certain amount of time the bankruptcy was filed, so you will need to check with an attorney whatever action you take is above board.
But in your scenario I would evict at the earliest legal moment for nonpayment.
It is really odd they are still paying lot rent - usually you see people just stop paying completely. That’s another thing to ask the attorney. This could be a professional squatter who knows how to drag out an eviction.