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MakeMKV fails to complete operation with BD of This is 40.

Operation successfully completed
Saving 1 titles into directory D:/Video/
Error 'Scsi error - MEDIUM ERROR:L-EC UNCORRECTABLE ERROR' occurred while reading '/BDMV/STREAM/00006.m2ts' at offset '1829437440'
Error 'Scsi error - MEDIUM ERROR:L-EC UNCORRECTABLE ERROR' occurred while reading '/BDMV/STREAM/00006.m2ts' at offset '1829437440'
Error 'Scsi error - MEDIUM ERROR:L-EC UNCORRECTABLE ERROR' occurred while reading '/BDMV/STREAM/00006.m2ts' at offset '1829437440'
Error 'Scsi error - MEDIUM ERROR:L-EC UNCORRECTABLE ERROR' occurred while reading '/BDMV/STREAM/00006.m2ts' at offset '1829437440'
Failed to save title 2 to file D:/Video//This_Is_40_t02.mkv
0 titles saved, 1 failed

Your drive cannot read parts of the disk.

First thing to try is to clean the disk. I use a soft cloth and Pledge furniture polish, which can fill in small scratches in the surface.

Sometimes the disk is defective, in which case, returning it for replacement is the way to go.