[1.1.1] (minor bug) sometimes damage in combat log gets marked as (Deathblows) even though no Deathblows is applied

See attached screenshot: 

Note that the lightning explosive damage in combat log is annotated with "(Deathblows)" but upon holding shift to expand the details, there is no application of deathblows damage at all.

Here's a dropbox link to a save, along with an output_log (in the save you'll have to craft some lightning bombs first): https://www.dropbox.com/sh/dcuepdin32awmfb/AACdgXzDgoPD8MU12plqWtE9a?dl=0