But this is often the result of the good property of OOP software. OOP software is easy to write, and allows for easily abstracting over problems.

The net result is OOP programs tend to be more complex. Not "more complex than equivalent software". More complex. But also more capable, more abstract, easier to extend, at least along foreseen lines, easier to change (although that's mostly a tooling thing I think).

But yes, bigger, more intricate software is more difficult to debug. Also abstractions don't help, because often the problem is that there are edge cases where the abstraction doesn't work. Also debugging with abstractions require you to know and understand what the abstraction does.