could well be the lower control arm rear bushes.
I replaced my lower control arms a few weeks ago, a huge difference to knocking sounds. Also when changing gears because of the torque applied at the wheel and transferred into the control arms.
very common for them to fail.
I replaced all 3 motor and gearbox mounts and I did not solve the problem... until I replaced the control arms.
especially when knocking during turns I would assume it could well be the control arms.
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