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I've had cases when
SimPE doesn't visually reflect changes in operands, but those operands in fact make a difference. Maybe it's because some primitives are not so well-studied or popular. I think, it was Run Tree by Name that caused me to pull my hair out. Even though it has pop-up wizard, it proved to be not fully comprehensive. Had to hunt down the right operands all over the internet and fill them in manually.
Because of that, I try to develop a habit of zeroing out operands when I add new line after another one - to clear junk data that can potentially cause trouble (I'm sure I still forget to do it half the time), and also copying instructions that 100% work in raw format instead of relying on description.
As for Stack Object ID 0 and Stack Object's object ID, I actually fell into their trap a while ago. That they both appear the same, unless you look closely. I had to learn it the hard way.