One more thing:
It seems to me that the problem occurs during browsing, if there is a thumbnail for the folder or file.
There are lot of messages like this in debug log:
2022-03-17 16:17:23.825 T:2670 DEBUG <general>: LIRC: - NEW 6c 0 KEY_DOWN linux-input-layer (KEY_DOWN)
2022-03-17 16:17:23.840 T:2598 DEBUG <general>: HandleKey: 167 (0xa7, obc88) pressed, action is Down
2022-03-17 16:17:23.843 T:3436 DEBUG <general>: ffmpeg[0xb309fbe8X]: [image2] Custom AVIOContext makes no sense and will be ignored with AVFMT_NOFILE format.
2022-03-17 16:17:23.844 T:2598 DEBUG <general>: [Warning] CGUITextureManager::GetTexturePath: could not find texture 'noop'
2022-03-17 16:17:23.852 T:3437 DEBUG <general>: ffmpeg[0xb2ca7c88X]: [image2] Custom AVIOContext makes no sense and will be ignored with AVFMT_NOFILE format.
2022-03-17 16:17:23.858 T:2598 DEBUG <general>: [Warning] CGUITextureManager::GetTexturePath: could not find texture 'noop'
2022-03-17 16:17:23.864 T:3437 DEBUG <general>: ffmpeg[0xb2ca7c88X]: [swscaler] No accelerated colorspace conversion found from yuv420p to bgra.
2022-03-17 16:17:23.864 T:3436 DEBUG <general>: ffmpeg[0xb309fbe8X]: [swscaler] No accelerated colorspace conversion found from yuv420p to bgra.
In case there is no picture for the folder the next keystroke works normally, if there is a picture then (the error message above comes, and) the next keystroke is lost.