When I saw the config parameter name baseScanRadius, I thought that it was telling me how many blocks the radius of the scan range is. However, when I tested it in game, with the default baseScanRadius of 64, a block was scanned only at a maximum of 32 blocks away from my character. As such, I would expect the scanning radius to be 32, not 64 as it says in the config. I realized just after this that the config file was describing the diameter of the scanning range, not the radius as the config parameter name suggests.

EDIT: Fabric 1.20.1, Scannable 1.7.12+18ccb75

I just realized... when it says baseScanRadius = 64 and rangeModifierModuleBlock = 0.5, the latter halves the former, doesn't it?