No completion for git subcommands

[Peter]

Package versions:

ii bash-completion 1:2.11-6ubuntu1
ii bash 5.2-1ubuntu2
ii git 1:2.37.2-1ubuntu1.2

While completions in Bash work for most commands I tried, they don't work work for Git sub-commands, as in:

git com<Tab> # Completes to "git commit"
git commit --am<Tab> # Does not complete to "git commit --amend"

It looks like none of git's subcommands get any command line flag/option/parameter/argument completions at all.