I've seen something similar across Claude versions.

With 4.0 I'd give it the exact context and even point to where I thought the bug was. It would acknowledge it, then go investigate its own theory anyway and get lost after a few loops. Never came back.

4.5 still wandered, but it could sometimes circle back to the right area after a few rounds.

4.6 still starts from its own angle, but now it usually converges in one or two loops.

So yeah, still not great at taking a hint.