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Redirecting error message from ${parameter:?word}

From: Michael Siegel
Subject: Redirecting error message from ${parameter:?word}
Date: Sat, 11 Jan 2020 22:33:13 +0100
User-agent: Mozilla/5.0 (X11; Linux i686; rv:68.0) Gecko/20100101 Thunderbird/68.3.0

Why is it, apparently, not possible to redirect an error message from a
${parameter:?word} expansion to /dev/null within the same shell instance?

Here's some code to demonstrate what I mean:

$ echo "$BASH_VERSION"
$ name=Max
$ printf 'Hello, %s.\n' "${name:?}"
Hello, Max.
$ name=
$ printf 'Hello, %s.\n' "${name:?}"
bash: name: parameter null or not set
$ printf 'Hello, %s.\n' "${name:?}" 2>/dev/null
bash: name: parameter null or not set
$ cat test


printf 'Hello, %s.\n' "${name:?}" 2>/dev/null
printf 'Bye\n'
$ ./test Max
Hello, Max.
$ ./test
./test: line 5: name: parameter null or not set
$ ./test 2>/dev/null


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