RetroArch 1.7.3, Genesis Plus GX and Sega Master System LightGun games

Hello,

I was using RetroArch 1.6.7 with the most recent Genesis Plus GX core to play Sega Master System games. When booting some light gun game, RetroArch auto detects the game and auto enables the mouse to emulate the Light Phaser. After update to RetroArch 1.7.3 the game is not auto detected as a light gun game and I need press F1 and so change the “System hardware” in core options between mark-III, master system or master system II, and after press F1 again, the mouse will work.

Am I missing to config something?

Thanks in advance and sorry my bad english.