I cannot reproduce any of this. If I enter the second game by hand up to 11. Ce4, switch on the AI and then play Cxe4, it replies with a double capture, and both victims disappear.
It doesn't seem to happen in Chrome, but it does occur in Microsoft Edge. Strange. But like I said, the bug seems to be a niche case, apparently more so than I was expecting.
Edit: It does happen in chrome, but under different circumstances. So strange...
I agree that the SAN needs reworking. As it is now, it also gets stuck on castling moves when the move has a tilde (~) in it.
It doesn't seem to happen in Chrome, but it does occur in Microsoft Edge. Strange. But like I said, the bug seems to be a niche case, apparently more so than I was expecting.
Edit: It does happen in chrome, but under different circumstances. So strange...
I agree that the SAN needs reworking. As it is now, it also gets stuck on castling moves when the move has a tilde (~) in it.