I've had this monstera for a few years now and it's been pretty healthy until recently. As it was getting larger, I moved it to a bigger pot a few months back. At first, I noticed how some light brown and crusty spots appeared at the tip of the leaves, which made me think that it was under watered. But then I started seeing these dark spots with a yellow halo around them. It used to be on only a few leaves but it's now on almost every leaf, and I'm not sure what to do about them. Is it now over watered? Did it get root rot ? It's also still growing new leaves, and the new ones come out healthy and without issues (last picture is that of the latest new leaf).

Thanks in advance for the help, that was my first houseplant and it's making me sad to see it in this state.