Night monsters burning in the sun.

When giving the command / time set day, nocturnal mobs that burn in the sun, such as zombies, skeletons and phantons, they take approximately 2 seconds to start burning, the same applies to the normal birth of the sun, rarely, when the sun rises , the monsters do not burn, only when the sun has already lit up a lot, so I want them to fix this problem, when it is daytime, I instantly want the mobs to burn.