I think it's a football thing. Oh and England Rugby.
I know when I was at the rugby world cup final 2015 Australia accepted and wore their medals but then in 2019 England refused to accept them or took them off straight away, it didn't go down well and was seen as being in poor taste not very sportsmanship.
It's akin to refusing second place on the podium at the euro athletics I suppose.
AHH well there's always next time.