Just a random thought.

I had a small single bulb floor lamp I used over a music stand. The switch was inline with the cord, not a slide switch but a thumb wheel type.

I put a CFL in it. I got arcing when switching and the switch didn't always work. I had to go back to an incandescent. My take was that the electronics in the CFL were too much for a maybe marginal switch. These run at a power factor less than 0.6. Anyway it worked fine with an incandescent.

And yet, now I have an LED in it and that also works fine.