This is partly why there have been rival Ebola-like 'haemorrhagic plague' theories of the Black Death, although they're still niche theories.
Confusing matters is the fact that some accounts of symptoms make it sound like Pneumonic plague was also affecting victims, and killing them even faster. Possibly there was some perfect storm of plagues spreading through multiple vectors at once, with haemorrhagic pneumonic and bubonic plagues striking at different places with different frequencies.
Without a means to distinguish between the plagues (and other diseases), pretty much any death caused by communicable disease would at the time be considered part of the Black Death.
Confusing matters is the fact that some accounts of symptoms make it sound like Pneumonic plague was also affecting victims, and killing them even faster. Possibly there was some perfect storm of plagues spreading through multiple vectors at once, with haemorrhagic pneumonic and bubonic plagues striking at different places with different frequencies.
Without a means to distinguish between the plagues (and other diseases), pretty much any death caused by communicable disease would at the time be considered part of the Black Death.