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BUG: Analysis Board - En passant target square missing in FEN

Steps to reproduce:

1) Open initial board position
2) e2-e4
3) FEN changes, but EP Target Square is missing

imgur.com/a/K7quv8k

Specification (Standard: Portable Game Notation Specification and Implementation Guide):

16.1.3.4: En passant target square

"[...] Therefore, an en passant target square field may have a square name even if there is no pawn of the opposing side that may immediately execute the en passant capture."

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