The change in [1] seems to break the ability of rl_trim_arg_from_keyseq to properly remove arguments provided as esc-prefixed digits -- the _rl_del_executing_keyseq call removes the digit from the key sequence but leaves the esc (and the digit is never added back).
$ bind -x '"\eX": ":"' $ ^[2^[X bash: bash_execute_unix_command: cannot find keymap for command [1]: https://git.savannah.gnu.org/cgit/bash.git/diff/lib/readline/misc.c?h=devel&id=88d69b4fa
