If this is a mod conflict, I suspect it is between this mod and the mod "weapon quality" due to the line in weapon quality's control.lua
item.set_stack{name = item.name:sub(1,-#item.quality.name-2), amount = 1, quality = item.quality}
This is being done to allow weapon damage and attack speed to scale with weapon quality, but is changing the weapon's name. I don't know what the output of the term "item.name:sub(1,-#item.quality.name-2)" is, but since from the faq it looks like weapon charging is based off item name, this probably explains my issue.
next steps: (that I may or may not take)
look into schall landmines and the rest of weapon quality to see if I can build a local patch.
in the unlikely event the above works, reach out to Schallfalke and OwnlyMe to for permission to make the compatibility patch public.
Alternative next steps:
wait and hope schall, ownlyme, or someone else patches this and lets me revel in the use of damage boosted quality chainsaws.