Saw a bug for the first time: checkmate froze the game with this image, no checkmate animation. The only distinct thing I can think of was it was a ladder mate with two queens.
Going to try replicating and find parameters before submitting report. Firmware 0.5.5.
I was able to recreate the issue. It seemed to do this if white was level 1 and black was either level 4, 5, or 6. It didn’t have an issue when white was level 1 and black was level 1, 2, or 3. I submitted a bug report.