Tile Source getRegion(format='numpy') raises error

[annehaley]

I have a cloud-optimized geotiff and I'd like to get the full image data at full resolution as a numpy array. I have tried to use getRegion(format='numpy') for this but the following error is raised:

line 62, in get_raster_data                                 
 source.getRegion(                                       
File "/usr/local/lib/python3.10/site-packages/large_image/tilesource/base.py", line 2058, 
in getRegion            
 iterInfo = self._tileIteratorInfo(**kwargs)             
File "/usr/local/lib/python3.10/site-packages/large_image/tilesource/base.py", line 605, 
in _tileIteratorInfo                                           
 magLevel = self.getLevelForMagnification(**magArgs)                    
File "/usr/local/lib/python3.10/site-packages/large_image/tilesource/base.py", line 2471, 
in getLevelForMagnification                                    
 mag = self.getMagnificationForLevel()                   
File  "/usr/local/lib/python3.10/site-packages/large_image/tilesource/base.py", line 2443, 
in getMagnificationForLevel                                    
 if mag.get('level') == self.levels - 1:                 
TypeError: unsupported operand type(s) for -:  'NoneType' and 'int' 

From my initial attempt to study the code, it looks like the mag object output from getNativeMagnification just lacks a key "level".

I have included the output of tifftools dump on the image in question.

cog_dump_output.txt