Battery block #12 stops working immediately after replacing battery block #5?

This is the second time I've replaced cells on this high voltage battery. The first time I replaced 4 cells and it worked for 2 years perfectly fine. Then I found myself in this situation where it looked like 1 battery cell was bad:

Before by Zach Dwiel posted Jul 9, 2024 at 3:25 PM

I took it apart and cell #10 (part of block #5) not notably lower voltage than the rest. So I replaced it with a new one and, put it all back together. About 30 minutes of driving and a few days later I get a warning again and so pull up dr prius. Now I get this:

After by Zach Dwiel posted Jul 9, 2024 at 3:25 PM

A completely different battery block appears to be poorly functioning. Could this simply be that I didn't reconnect one of the wires well or something like this? It appeared perfectly fine prior to my upgrade. I can certainly replace it, but I want to make sure there isn't something else I am doing wrong that might cause this. When I replaced the cell, I measured the voltages of each cell with my multimeter, and replace only the cell which was low:



I have all of the cells numbered with a permanent marker to keep track of the order they are in from last time and that order has not changed. What else could be going wrong here? Might it just be a coincidence since the battery is getting old (190k miles) and a new cell happened to fail right at the same time?