diff --git a/overviewer_core/world.py b/overviewer_core/world.py
index 5dcecad..856e7f4 100644
--- a/overviewer_core/world.py
+++ b/overviewer_core/world.py
@@ -1262,8 +1262,11 @@ class RegionSet(object):
     def _get_blockdata_v113(self, section, unrecognized_block_types, longarray_unpacker):
         # Translate each entry in the palette to a 1.2-era (block, data) int pair.
         num_palette_entries = len(section['Palette'])
-        translated_blocks = numpy.zeros((num_palette_entries,), dtype=numpy.uint16) # block IDs
-        translated_data = numpy.zeros((num_palette_entries,), dtype=numpy.uint8) # block data
+        # Due to Minecraft bugginess, we extend this array to contain zeroes all the way to the
+        # maximum palette index Minecraft can request in Minecraft 1.16
+        next_pwr_two = 1 << math.ceil(math.log2(num_palette_entries))
+        translated_blocks = numpy.zeros((next_pwr_two,), dtype=numpy.uint16) # block IDs
+        translated_data = numpy.zeros((next_pwr_two,), dtype=numpy.uint8) # block data
         for i in range(num_palette_entries):
             key = section['Palette'][i]
             try: