A five-second time penalty stripped Alex Dunne of his chance at a second Formula 2 triumph during the race in Baku.
The incident occurred when the twenty-year-old driver crossed the white line marking the entrance to the pit lane while switching tyres mid-race.
This error handed the win to Rafael Camara, who finished ahead of Dunne and fellow title contender Nikola Tsolov.
Camara, driving for Ferrari Academy, secured a seven-point lead over his Bulgarian rival in the overall championship following the result.
Dunne retained third place on the leaderboard, marking a third podium finish for the Irishman across the weekend's events.
He had previously dominated the opening feature race on Friday and also took third place in the sprint session earlier that day.
Red Bull junior driver Nikola Tsolov recovered from a crash in the first feature race to challenge for the lead later in the afternoon.
Despite Dunne's strong recovery, he remains eighteen points behind Camara in the standings with the season nearing its conclusion.
Uncertainty persists regarding the final two rounds of the calendar, which were scheduled to take place in Qatar and Abu Dhabi during November and December.
These support races for Formula 1 have been reported as potentially affected by ongoing conflict in the Middle East.
Imola in Italy has been identified as a possible replacement venue should the remaining rounds not proceed as planned.
The outcome of the championship's end remains unclear until further information is available regarding the race calendar.
Dunne's performance keeps him firmly in contention for the title despite the setback inflicted by the penalty decision.