Obscure rule, or bug? - Chess Forums

Hi This has had me curious for a while, and I've found no answers, so I thought I'd see if anyone here knows. Windows Vista/7's Chess Titans seems to allow you to castle through check if the attacking piece is a pawn. I thought castling through check is illegal, full stop? I've searched and searched

Chess variants and 3D chess

Gukesh beats Kramnik 3 times in Airthings Masters Play-In

Chess Variants: Entertaining, fun, instructive

Bughouse Chess Variant - Chess Terms

1300+ puzzle on chesscom, 47% pass rate : r/chess

Chess robot breaks child's finger after premature move

Chess Forums

Tata Steel Chess 4: Both Carlsen and Ding defeated

Chess Set leaves Wooden Board Elite Classic - Hong Kong

Best move in algebraic chess notation, Password Game rule 16 answers

3 Dimensional Chess, Board Game