Collapsed lunghad markers placed in liver 3 weeks ago had collapsed lung, treatment chest tube, could it reoccur?

Unlikely. If due to the test and needles , it is unlikely to recur. Spontaneous pneumo does have a significant spontaneous recurrence rate.
May be. Depends on cause. If the cause was direct puncture of lung during procedure, then it will not happen again. If it was, say a bleb, it could happen again.