Where again, mitigating factors apply before taking the damage.
This is where you are wrong ...
https://www.dndbeyond.com/spells/2296-warding-bondAs you can see the description says:
"
Also, each time it takes damage, you take the same amount of damage."
Notice, that there is not a single word about "
type" of damage, wich is important ...
Bcs this damage have no type, you have no "mitigating factors" to apply.

Its a common misstake.

But there is a point for "no type" damages ... one of their strengths is that they cannot be resisted in any way ... from top of my head, i remember Hunter's Mark, or Sneak Attack ...