Other enemies spawning when fighting a boss in master mode

[SaltyBeggar]

I am playing in master mode and I actually could see that enemies are spawning with more frequency during boss fights, probably because master mode adds a higher spawn rate, but this becomes turning very annoying.
I was fighting skeletron prime and a wyvern appeared in mid-fight, and completelly ruined all the fight, please make enemies spawn rate lower during boss fights