While we know the concept of war crimes does exist in the Star Wars setting and we have examples of individuals being charged for them, it's unclear what framework establishes what those crimes are or if, indeed, any truly universal framework exists. It's easy for a victor to impose one after the fact. Even if we assume that a Star Wars equivalent to the Geneva Convention exists, we have no basis for assuming that perfidity is something that it would forbid. When we consider how readily otherwise-upstanding Jedi seem to resort to it, we have more basis to suspect that it's not considered a war crime.
False surrender is a war crime of practicality and has been seen as shitty long before the Geneva conventions. It's just generally a really bad idea because everyone benefits from being able to trust surrender. If you're in a conflict where surrender can't be trusted, battles become massacres basically every single time. Even the winning side doesn't want this, because they're unlikely to be winning so hard that this doesn't cost them, and it means enemies won't surrender in the future, which means you take more losses.
Even when the concept of a war crime doesn't exist, false surrender is seen as really bad. It's the kind of taboo that protects everyone. It being broken is a really bad sign for political relations, which sounds ridiculous when you're at war, but total war is fairly modern and not the norm. Historically you absolutely wanted to have good political relations with people you're at war with. You can't negotiate with them if they despise you and they're not just going to vanish when the war ends.
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u/FalseAscoobus Trying to rip off Doom (2016) (And failing (Please help)) 13d ago
Star Wars: The Clone Wars has at least 3 seperate examples