My reviews have gotten good, and I catch real problems now. But when it's a senior engineer's code and something feels off, my hands hover over the keyboard and I just approve it anyway. Later, when the thing I sensed turns into a bug, I sit there knowing I felt it coming and said nothing.
More people experience this than they realize.
You can spot the problem, but you can't make yourself challenge someone more senior.
If this sounds familiar, the Library can help you find the bigger picture.