Internet speeds plummeted after the Windows 11 May Update, dropping from 1 Gbps to 100 Mbps

After updating to version 26200.8457 in May, my wired internet speed suddenly slowed down. When I ran a speed test using my Gigabit broadband connection, the download speed dropped to only about 100 Mbps. Everything was working fine in the April version; this issue only appeared after the update.
I suspect it might be a hardware issue, but since it started after the system update, I’m not sure what the actual cause is. I’m wondering if anyone else has encountered the same problem?

check your cabling, also try manually setting your link speed.

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Sounds like the cable is linking at 100mbit instead of 1gbit.