Chests placed in beta 1.7.3 or earlier stay intact up to updates 1.7.10, but updating past that deletes them even with an intermediate update.
This occurs providing you havent interacted or loaded them. There was an instance I havent been able to replicate where the chests near my player on the map did change to the minecraft:chest format but the chests further out of loading range remained in Chest format and were deleted in 1.8+
Alabar3000
Chests placed in beta 1.7.3 or earlier stay intact up to updates 1.7.10, but updating past that deletes them even with an intermediate update.
This occurs providing you havent interacted or loaded them. There was an instance I havent been able to replicate where the chests near my player on the map did change to the minecraft:chest format but the chests further out of loading range remained in Chest format and were deleted in 1.8+