I watched the old post https://bugs.mojang.com/browse/MC-1769 ，I see standing inside TNT/Glowstone/Block of Redstone was fixed now, but standing inside tree leaves still can let people see through blocks, if you turn your render quality to fast mode.
To reproduce:
1, change render quality to fast.
2, place some tree leaves, at least 3x2x3, and teleport you inside it.
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wobst.michael
Duplicate of MC-97047. Please go and upvote that ticket instead. Also please use the search function next time before creating a ticket to save everyone a lot of time.
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I'm sorry for that, and I had used search function to find the keyword 'xray', but I only found the old post: https://bugs.mojang.com/browse/MC-1769
Maybe my English is too bad for creating tickets...