In Vyos 1.2.0-rolling the configuration statments
set protocols ospf area 172.24.31.248 area-type nssa 'no-summary'
Gives
[ protocols ospf area 172.24.31.248 area-type nssa ] % Unknown command: area 172.24.31.248 nssa translate-candidate no-summary
This breaks routing to the NSSA area after upgrade.