Query Editor - Split Column By #(lf) Line Feed

Without reading all the details of your post, I see "#(#)lf" in your code and coincidentally I just came across the phenomenon: wheneve you enter a special character code like "#(lf)" in some UI text box, the code generated will change it in "#(#)lf".

You should adjust the code to "#(lf)".

Edit: now I read the post from Ken Puls and he mentions this phenomenon too.

After that, you won't be able to adjust the code via the small wheel right from the step name, but only via the formula bar or the advanced editor.

So far I know about 1 exception: when splitting columns by delimiter via the UI, in the popup under advanced options, you can check "Split using special characters": when you select a special character from the list, or enter your own special character, in both cases you must have that "Split using special characters" checked.

Edit 2: maybe you can use the Lines.ToText function.

Edit 3: another exception is the option "Replace Values" for text columns: