Siphon bullets bonus spirit damage until sold?

[Liqvid]

I am not sure if this only occurs in the sandbox but it is easy to reproduce there.

1. Buy Siphon bullets.
2. Shoot target dummy. Note the extra 45 spirit damage being applied every few hits (as well as the siphon max hp effect).
3. Then sell Siphon bullets.
4. Then re-buy Siphon bullets.
5. Shoot target dummy. Note that the 45 spirit damage no longer occurs. The siphon effect still occurs normally, but that bonus damage is gone forever on the character you are controlling until you exit and recreate the sandbox.

If you spawn another character and take control of it you can repeat these steps on that character.

Is this bonus spirit damage even intentional?

Side note: The 45 bonus damage is fixed damage. It is not reduced by distance from the target (See screenshot 3, Dynamo), nor is it increased by spirit power.