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What provides ‘bash’ on your system? Other shells will choke on its array syntax.

nope. i use konsole and i have never installed anything other so it would be bash

Like, an ancient version of bash.

Can you please try doing this:

$ echo $BASH_VERSION

5.0.17(1)-release

My dude, that's not ancient at all! You should be good, so that's perpelxing.