Same here, I have video of it too just trying to figure out a away to make it in gif form. I had 3 siphons in a row not work. 2 was the bug you mentioned, 1 was none of the braids spawned at all and dash/shooting it with op broke nothing. I guess they figured we needed more RNG on top of our RNG.
Will there be any fixes to kuva siphons? It's a gamble if they will even work. I have video if you need to see whats up. Also why was none of the changes to Taveuni not listed or mentioned in the patch notes? It's sooo much more buggy and inconvenient than it was before.