I also found another bug where a piece that promotes to a burner doesn't show in the promotion options and then promotes to a white burner if the moving piece was black. Take for example the Chess Knight in the diagram in my last comment.
[Edit]: Pieces that promote to burners upon being asked for promotion choice (at least for Shogi-style promotion) will also burn pieces regardless of whether promotion is accepted or deferred, even if the original piece does not burn.
I also found another bug where a piece that promotes to a burner doesn't show in the promotion options and then promotes to a white burner if the moving piece was black. Take for example the Chess Knight in the diagram in my last comment.
[Edit]: Pieces that promote to burners upon being asked for promotion choice (at least for Shogi-style promotion) will also burn pieces regardless of whether promotion is accepted or deferred, even if the original piece does not burn.