There were no messages about any unmounting. These are simple single full-disk size partitions.
Yes, the disks are GPT formatted but were opened as physical disks.
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I am the author of this screenshot. I suspect also some variable-length problems when dealing with 4 TB disks. (Maybe sector is out of range etc.) In this case it is SSD, exactly Samsung QVO 860. The same error is on WD My Book 4 TB external drive. I just checked right now. However HxD version 1.7.7...