Beam blend mode bug?

[Hendrik Lober]

Hey there folks!

I am trying to replace the laser beams "head", "body", "tail", "start" and "end" animations with something funny.
Since these are all default sprite prototypes I prepared my images as normal transparent PNGs.
However, it appears to me that they are always shaded as additive!
I set the "blend-mode" to "multiplicative", "additive-soft" and they seem to behave as expected.
However, when I set it to "normal" it is the same as "additive". The sprites are overblown and too bright as would be expected from additive blend mode.
When I replace the sprite with a black one it is gone, which also would be expected from the "additive" blend mode.

I even tried changing the sprites flags but I am at my witts end.
Does anyone have an idea how to fix this or if it is at least a known issue?

Thank you for your time
Kind regards
Hendrik