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Vengeance (2022)

Maybe I'm missing the joke, but there definitely is a gun in uncle vanya.

Here's the TVTropes entry on this instance:

Chekhov's Gun: Ironically averted. When Vanya does attempt to murder the professor, it is totally done off-stage with no clues present that he is about to shoot him.

https://tvtropes.org/pmwiki/pmwiki.php/Theatre/UncleVanya

Interesting.