{stmts} don't read from pipe?

[Mudd, John]

Configuration Information [Automatically generated, do not change]:
Machine: i686
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='i686'
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i686-pc-linux-gnu'
-DCONF_VENDOR='pc' -DSHELL -DHAVE_CONFIG_H  -I.  -I. -I./include
-I./lib  -g -O2
uname output: Linux utah.imagesoft-technologies.com 2.2.17-8 #1 Fri Nov
17 16:22:25 EST 2000 i686 unknown
Machine Type: i686-pc-linux-gnu

Bash Version: 2.05b
Patch Level: 0
Release Status: release

Description:
The statements in {} don't read from the pipe.  The same happens in
version 2.04.11(1).

Repeat-By:

$ cat bashBug.sh
echo 'aaaaa
bbbbb' |

{
 read a
 read b
}

echo "a=[$a]"
echo "b=[$b]"
$ ksh bashBug.sh
a=[aaaaa]
b=[bbbbb]
$ bash bashBug.sh
a=[]
b=[]
$