Comment # 14 on bug 1213353 from Christian Boltz

(In reply to Dr. Werner Fink from comment #5)
> Just to be sure ... you have installed bash-completion as well ... 

Right, bash-completion-2.11-7.1.noarch

> do you
> have something in path which is named `systemct` (not `systemctl`) ... shell
> function, further command, or an alias?

No,   systemc<tab>   only results in   systemctl   (for both user and root)

(In reply to Dr. Werner Fink from comment #6)
> Also I'd lik eto see your prompts PS0, PS1, PS2, PS3, and PS4

cb@tux:~> echo $PS0

cb@tux:~> echo $PS1
\u\[\e[0m\]@\h:\[\e[1;37;44m\]\w\[\033[0;0m\]>
cb@tux:~> echo $PS2
>
cb@tux:~> echo $PS3

cb@tux:~> echo $PS4
+

I also have a PROMPT_COMMAND:

cb@tux:~> echo $PROMPT_COMMAND
setLastCommandState;setGitPrompt

which is from git@github.com:cboltz/bash-git-prompt.git (actually a version
from 2019, 148d502b666a0d62ecc83680817596b097a70f2a)

(In reply to Dr. Werner Fink from comment #9)
> OK ... that is what we already know ... the real reason/cause would be a win.
> Error in bash/libreadline ... or in (g)libc ... or overheated system

Given the hot weather in the last days, I wouldn't rule out overheated system.
However, this was the only strange issue I noticed during these hot days.