It is not unusual to have sensitivity to biting after RCT. The tooth has to be adjusted so that you do not touch it(taken out of occlusion) when you normally bring your teeth together. If this is not the case then return to the dentist and get it adjusted. I would also think that you would want that tooth restored as soon as possible after the soreness dissipates so that you don't take the chance of the tooth fracturing.
it happens often. the ligament around the tooth can get inflamed from the procedure, so when you bite on it , the tooth hurts. make sure that you cannot touch this tooth with the opposing tooth when you close your mouth with no food. if you can, the dentist needs to reduce the tooth ever so slightly so you cannot hit it when you bite. this will help thing calm down. it is also possible the tooth has a fracture but I would not jump to that just yet. ask the endo who did it.