Hey there and welcome to the Samsung UK Community Forum
I took am experiencing this but only with certain Samsung Chargers on the S23 Ultra.
All of my charging bricks are genuine Samsung either 25w or 45w (the issue only occurs using the 25w, when using 45w no issues at all). Cables are also genuine Samsung, all came with devices.
I am not employed by Samsung nor do I receive any remuneration as a Samsung Members Star.
My device is an S25 Ultra.