I'm always surprised to see bugs like this where an extremely easy to test part of the spec just seemingly isn't tested and ends up as a bug that never gets fixed until many years later.
Or tragic, but I rather see drama than joy with this approach. The main thing with bugfixing is, that it can affect a whole lot of other areas, or introduce completely new bugs. So both teams then fighting over changes ..
Now a really trivial bug with no side effects, sure thing, no issue, but like a sibling commentor has said, the really trivial bugs are usually fixed already. And quick fixes of seemingly trivial things can induce a world of pain for someone else.
In other words, I think project management and prioritising things remain hard, with no magic bullets solutions avaiable. (But I wpuld also prefer a stronger emphasis on quality control in general, vs new feature)