Officials eased rules for Wednesday’s final, in which Lokomotiv won 5-3 on penalties, increasing the number of fans allowed at the stadium from 4,000 to 12,000.
CNN contacted Bulgarian FA, CSKA Sofia and Lokomotiv Plovdiv for comment, but did not receive an immediate answer.
The match ended 0-0 after extra time, but the 100% penalty conversion rate saw Lokomotiv retain the Cup and secure a place in the Europa League qualifying rounds.
CSKA head coach Milos Kruscic got up after the game.
The final on Wednesday raises additional questions about holding football matches with fans in attendance.
Bulgarian Sports Minister Krasen Kralev reportedly said violations during Wednesday’s game could lead to the implementation of “more drastic measures”.
The Balkan countries, which have seen less serious coronavirus epidemics compared to other European countries, opened up sporting events relatively quickly.
The Adria Tour was sharply criticized after several of the best players, including Djokovic, tested positive for coronavirus, which he played in another competition in Zadar, Croatia.
Schedules in the UK, Germany, Italy and Spain took place behind closed doors, while in other European countries some fans retaliated.
For example, in Denmark, a limited number of spectators are allowed to enter stadiums while observing social distance.
This resulted in a sudden popularity, with the country’s football federation securing new broadcasting contracts in as many as 10 countries.