1. Place a chest with the default network setting. Place a second chest and set the network to "1."
2. Copy the settings of the chest with network "1" to the chest with the default network setting using Shift+RMB and Shift+LMB.
3. Delete both chests.
4. The counter shows 1 non-existent (or virtually existing) chest.

P.S. Repeating the algorithm continues to increment the counter.

UPD: Just in case this helps, the chest counter doesn't update when using the Shift+RMB and Shift+LMB combinations.

Thanks for the report, I think I understood the issue and fixed it in version 0.1.2, it was indeed a copy-paste related bug.