Setting gamerule "doTileDrops" to false causes items from a chest destroyed by a command block to be destroyed. This was not the case in 1.12.2 as the items inside the chest would be dropped when doTileDrops was false.
Environment
OS: Windows 10 Professional (Build 17134)
Java: 1.8.0_25 64bit
Thank you for your report!
However, this issue has been closed as a Duplicate of MC-121823.
It has been linked to this report. If you have additional information, please add it to the duplicated report.
Please search before reporting, as it's likely that one exists already.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – 📖 Game Wiki