teleporting via /tp or server commands, or joining a world will cause all chests within the same chunk to lose all NBT data, and fail to load the block entity, until interacted with; interacting with a chest that fails to load with this chunk error, will cause the block entity to appear, however, all NBT data associated with the chest will vanish
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Same bug happened with 18w44a after transporting a villager through the Nether and going to the portal, all chests empty on the chunk where the said portal was standing in the Overworld.

My 3 house chests were empty when I just logged on. I started the world last night. I'm not sure when they became empty. I did zone into the nether briefly for the first time as one of the last things I did before logging off last night, and the portal is very close to the house (as above person was speculating).
The chests were first invisible when I logged on today and then when I right-clicked them, they became visible (but empty). I'm afraid to play this version any more. Please fix ASAP so I can keep testing. 😃
18w46a

Same happened to me on single-player when I opened my world and closed it with "Save and Exit" as soon as it opened. (It didn't even have time to load properly.)

Still happens to shulker boxes in 18w47a.

Still an issue in 47b?

Confirmed for 18w47b.
Last time it happened to me, it was after a pigman goes through a Nether portal and "duplicated himself". Reloading the area caused the chest to not render and to lose their inventory data.
The entity duplication glitch is commented and issued in MC-138919.
Uploaded a screenshot where you can guess chests and signs contents are missing.

Bug still in 18w48a ....

still bug in 18w49a ..#$^&

Same bug for Me. Lost all my Item i farmed in 8 Hours 😞

Just wanted to mention I have this same issue with 18w49a.

This also happens with command blocks in creative mode in 18w49a.

Fixed in 18w50a.

Please resolve it.