After sealing a barrel, the barrel noted the time it had been sealed, and what it would produce correctly. After exiting the single player world and reloading it, however, the output text vanishes, though the date sealed remains.
Before closing world: https://i.imgur.com/KY1scVa.png
After reopening: https://i.imgur.com/XzXPtQT.png

Identical to #392