The fact that Rockstar didn’t notice this is frankly shocking and speaks to the fact that they really just don’t care.

In this case it’s more to do with the size of the company and the fact that the programmers don’t get the time to look through and find everything. Even if they did know about it, they may not get the time or resources to fix it because they have schedules and deadlines.

They almost immediately fixed the problem when that modder came to them with the fix and they even paid him a bounty for it.