the skeletons does not burn when it is day
EDIT:i waited 3 minutes and nothing happens and new images!
EDIT 2:ITS RESOLVED 😃!!
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WAI: They don't burn instantly, it takes a moment...
Since they don't seem to burn in your screenshot after waiting, I simply cannot reproduce this because in 18w30b they still burn from my observation.
Cannot confirm. The skeleton burns in daylight as expected.
It's possible that your skeleton (just barely) got under a tree to protect it from daylight.