Cache not working correctly when resampling MODIS granule

Code Sample, a minimal, complete, and verifiable piece of code

from satpy import Scene
scn = Scene([inf], reader='modis_l1b')
scn.load(['27', '29', '31', '32', '33'], resolution=1000)
scn2 = scn.resample('laea_bb', 
                    radius_of_influence=15000,
                    resampler='bilinear',
                    cache_dir='./CACHE/')

Where inf is a MODIS L1b granule. I'm using MOD021KM.A2006091.1605.061.2017263021720.hdf

Problem description

When resampling a MODIS granule onto the laea_bb area def (which is defined based on the granule itself, rather than a predefined extent) the cache_dir seems not to work. Each time I run the above code a new set of coefficients are generated in the ./CACHE/ dir rather than using the existing ones.
I expect this is due to the dynamic nature of the area definition. Maybe something with floating point precision in the extent?

Versions of Python, package at hand and relevant dependencies

Satpy: 0.22.0
Pyresample: 1.16.0