I don’t think that this bugginess is an inherent property of these languages, because there are other practices that could lead to reduction in total bug count and severity, apart from integrating additional tooling.

Out of curiosity, how many bugs you found by using these tools could have been avoided by using a “watertight” memory management system [0], with strong decoupling of pointer and object lifetimes?

[0] https://floooh.github.io/2018/06/17/handles-vs-pointers.html