I can confirm this bug. 10G_1 port cannot get IP if it's used as WAN port and if it's used on br-lan device/s connected to it cannot get IP from DHCP. This is with NSS wifi builds.
I tested only @qosmio NSS wifi build and with QNAP stock 10G firmware loaded from NVMEM. 10G_2 port works OK. Maybe it's not so strange because QNAP uses 2 separate firmwares for each 10G port. But with regular OpenWrt build both 10G ports work OK.
Should work OK with the previous method to load 10G firmware from U-boot.
57.312453] IPv6: ADDRCONF(NETDEV_CHANGE): lan1: link becomes ready
[ 58.208483] nss-dp 3a001800.dp5 10g-1: PHY Link up speed: 1000
[ 58.208603] br-lan: port 1(10g-1) entered blocking state
[ 58.213228] br-lan: port 1(10g-1) entered forwarding state
[ 58.272735] nss-dp 3a007000.dp6-syn 10g-2: PHY Link up speed: 1000
[ 58.272831] br-lan: port 2(10g-2) entered blocking state
[ 58.277826] br-lan: port 2(10g-2) entered forwarding state
[ 58.330289] uniphy autoneg time out!
[ 68.512664] nss-dp 3a001000.dp1 lan4: PHY Link up speed: 100
[ 68.512829] br-vlan: port 1(lan4) entered blocking state
[ 68.517414] br-vlan: port 1(lan4) entered forwarding state
[ 68.523387] IPv6: ADDRCONF(NETDEV_CHANGE): br-vlan: link becomes ready
[ 292.766785] nss-dp 3a007000.dp6-syn 10g-2: PHY Link is down
[ 292.767066] br-lan: port 2(10g-2) entered disabled state
[ 298.846625] nss-dp 3a001800.dp5 10g-1: PHY Link is down
[ 298.846905] br-lan: port 1(10g-1) entered disabled state
[ 320.415120] nss-dp 3a007000.dp6-syn 10g-2: PHY Link up speed: 1000
[ 320.415279] br-lan: port 2(10g-2) entered blocking state
[ 320.420218] br-lan: port 2(10g-2) entered forwarding state
[ 347.038941] nss-dp 3a007000.dp6-syn 10g-2: PHY Link is down
[ 347.039223] br-lan: port 2(10g-2) entered disabled state
[ 351.135159] nss-dp 3a007000.dp6-syn 10g-2: PHY Link up speed: 1000
[ 351.135279] br-lan: port 2(10g-2) entered blocking state
[ 351.140255] br-lan: port 2(10g-2) entered forwarding state
[ 373.663025] nss-dp 3a007000.dp6-syn 10g-2: PHY Link is down
[ 373.663450] br-lan: port 2(10g-2) entered disabled state
[ 377.759283] nss-dp 3a007000.dp6-syn 10g-2: PHY Link up speed: 1000
[ 377.759432] br-lan: port 2(10g-2) entered blocking state
[ 377.764380] br-lan: port 2(10g-2) entered forwarding state
[ 410.463207] nss-dp 3a001800.dp5 10g-1: PHY Link up speed: 1000
[ 410.463359] br-lan: port 1(10g-1) entered blocking state
[ 410.467958] br-lan: port 1(10g-1) entered forwarding state
[ 411.332268] uniphy autoneg time out!
Doesn't work with 2.5G mode either.
nss-dp 3a001800.dp5 10g-1: PHY Link up speed: 2500
br-lan: port 1(10g-1) entered blocking state
br-lan: port 1(10g-1) entered forwarding state
uniphy autoneg time out!
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