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This issue appears to persist in OPNsense Business 26.10, which is based on Community 26.7.7.
On a DEC4280 with Intel E810-XXV-4, the 25G LAN link did not establish after upgrading from Business 26.1 to 26.10. 

ice0 remained administratively UP but reported status: no carrier.
ifconfig -m ice0 still showed 25GBase-SR support. 

Driver/firmware details:
ice 1.43.3-k
DDP 1.3.41.0
FW 7.3.4
NVM 4.30 

dmesg repeatedly showed:
All configured link modes were attempted but failed to establish link. 

Setting
sysctl dev.ice.0.requested_fec=RS-FEC
immediately restored the link. Afterwards:
requested_fec: RS-FEC
negotiated_fec: RS-FEC
current_speed: 25 Gbps 

Link partner is an Aruba 8100. The link worked correctly before the Business 26.10 upgrade.