It's not really an issue, if the library is buggy and leaks or keeps reference to things it's not supposed to, it will be the same whether it's RC or just plain memory management.
It's just better documented and easier to spot the bugs if you're doing RC.
It not about bugs, rather C++'s lack of support to enforce that RC is not misused and programmers cannot grab RC internals and corrupt the data structures.
It's just better documented and easier to spot the bugs if you're doing RC.