I created an issue in tracker for Steam Linux client: https://github.com/ValveSoftware/steam-for-linux/issues/11518 Found some logs in Steam directory:
[2024-11-26 23:30:25] Client version: 1731433018
[2024-11-26 23:30:25] Init: enable connect workaround: 0
[2024-11-26 23:30:25] Init: create NetworkManager client: success
[2024-11-26 23:31:15] Device[0xd32c0739] state: Unknown/Connected -> Deactivating/Disconnecting - reason: user-requested
[2024-11-26 23:31:15] Device[0xd32c0739] state: Deactivating/Disconnecting -> Disconnected/Disconnected - reason: user-requested
[2024-11-26 23:31:15] Device[0xd32c0739] state: Disconnected/Disconnected -> Unavailable/NotPresent - reason: carrier-changed
[2024-11-26 23:31:19] Device[0xd32c0739] state: Unavailable/NotPresent -> Disconnected/Disconnected - reason: carrier-changed
[2024-11-26 23:31:22] Connect: interface: enp8s0
[2024-11-26 23:31:22] SetIPv6Config: IPv6 libnm workaround: 1
[2024-11-26 23:31:22] Connection invalid: ipv6.method: property is invalid
Interesting...