Has anyone else started seeing errors like this (& other stuff) when restarting/restoring sessions in Apple Terminal.app?

date: illegal time format
usage: date [-jnRu] [-I[date|hours|minutes|seconds]] [-f input_fmt]
[-r filename|seconds] [-v[+|-]val[y|m|w|d|H|M|S]]
[[[[mm]dd]HH]MM[[cc]yy][.SS] | new_date] [+output_fmt]
-bash: Saving: command not found

See also this: it’s coming from weird interactions in /etc/bashrc_Apple_Terminal (& similar for zsh). Is this widespread or rare?