Note here how red sandstone and other blocks have a darker left side, whereas shulker boxes have all three faces equally lit.
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2D items also seem to be darker than they should be.
That's MC-161843.

Actually, shulker boxes and chests do have weak shading in 19w41a .... could be a little more though

May be fixed in 19w44a, I cant really tell.
Confirmed. Chests are affected as well. Beds are not.