behave quite strangely.
The MapBlock file format (sectors2/XXX/ZZZ/YYYY):
+-------------------------------------------------
NOTE: Byte order is MSB first.
- 0xffffffff = invalid/unknown timestamp, nothing will be done with the time
difference when loaded (recommended)
+Node metadata format:
+---------------------
+
+Sign metadata:
+ u16 string_len
+ u8[string_len] string
+
+Furnace metadata:
+ TBD
+
+Chest metadata:
+ TBD
+
// END