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Hello!
I have some difficulty with converting one flowing liquid to other. If I simply call add_node() with target flowing liquid and set the same level, as it was for the original liquid, my target liquid disappears, because I have no source of this liquid. I don't see some simple solution of such problem( But maybe it exists?

I have not tried it, but if I recall correctly, the liquid level is stored in param2.
You could do something like

on the flowing liquid node and see what happens.