So I decided to try reflowing the ethernet phy to make sure that nothing is shorted.

After doing so the ethernet phy started replying to management commands 🙂

Altough I think that it might have shorted nRST and TX_EN together because the basic status register is always indicating jabber detection, and when i try to manually de-assert TX_EN the LAN8720A resets.

Another problem is that it will only detect a link if I set the switchport to 10Mbit.