Weird experience replacing rear taillights (Bulbs went out)

So I did a good brotherly repair on my sister 2015 Prius V. I exchanged the Prius drivers side rear tail light after it got crack from a table. But when I put the bulb back, I find the turn signal and the reverse lights aren’t working. Those are the only light bulbs I took out.

I start the car and reverse and turn signals don’t turn on! I trouble shoot for 30 mins. Then got the idea to swap bulbs to test. So swap passengers side bulbs and what do you know!?!?! It works!!!!

Run to autozone get new reverse and turn signal bulbs and everything is working.

But why would both bulbs go out. They were perfectly find before I messed with them.