Not sure how helpful this is but I have a small 5-port Tp-Link switch connected to my adapter with no problems. Just plugged it in and it worked. I run three computers off the switch. The activity LEDs blink happily and I get great speed. No impact on the wifi part of the system.
You say that you're extending wifi via the switch, maybe another access point? I have read that the only way to reliably extend the wifi is with the Starlink Mesh (another Starlink router unit). Someone also said it could affect the main wifi. Not sure I understood your comment correctly.
