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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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.
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.