noclobber and redirected group command

[chris]

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS: -g -O2 -fdebug-prefix-map=/build/bash-a6qmCk/bash-5.0=. 
-fstack-protector-strong -Wformat -Werror=format-security -Wall 
-Wno-parentheses -Wno-format-security
uname output: Linux athena 5.4.0-65-generic #73-Ubuntu SMP Mon Jan 18 17:25:17 
UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
Machine Type: x86_64-pc-linux-gnu

Bash Version: 5.0
Patch Level: 17
Release Status: release

Description:

When using errexit and noclobber, a group command redirected to
overwrite an existing file should cause script termination but doesn't.

Repeat-By:

----------------------------------------------------------------------
#!/bin/bash
#
# Why can we get "here" but not "there"?
#
shopt -s -o errexit noclobber
touch /tmp/test.out
{ echo a; } > /tmp/test.out
echo here
echo a > /tmp/test.out
echo there
----------------------------------------------------------------------