Mobs do not burn in sunlight sometimes. Thats all I know.
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When I had triggered them to attack they started to burn.

Ok, little update... They are spawning at day... I went to sleep in the evening.
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They are in new chunks for sure. I'm traveling on my horse to new locations and mobs are already there.
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Spiders generated that way attack you during day. When you run away and come back they dont attack you anymore as they should.
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Day, swamp. Glow squid... 😉
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Hello! This is a duplicate of MC-223255.
This is actually a duplicate of MC-214793.