Re: Port 4 of KSZ8895FQXI switch
Just above that diagram in the datasheet is this:
• KSZ8895FQX: Four 10/100Base-T/TX transceivers on Ports 1, 2, 3, and 5 (port 3 can be set to fiber mode). One100Base-FX transceiver on Port 4. One SW5-MII and One P5-MII interface
So port 4 is only FX mode.