cracked transparent edges beside faded out edges at noise material

Hi there,

i tryed to make a space nebula and played around with noise.
Now i get some good results (for now) but i have some incredible cracked edges beside some good faded out edges.
Full view:
Screenshot 2024-01-21 213247

Zoomed:


Screenshot 2024-01-21 213333

The blue edges on the top or left started hard and got smoothened to transparency.
But the red edges at the bottom are extremely hard cracked.
I tested the Screenshot 2024-01-21 220939 but nothing happend. Or i doing it wrong.

The material:

Anyone have a good idea for that?

Have a great day.
Kronod