UTF-8 regression in bash 4.2 (from 4.1)

[dennis]

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu (Gentoo)
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64' 
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-unknown-linux-gnu' 
-DCONF_VENDOR='unknown' -DLOCALEDIR='/usr/local/share/locale' -DPACKAGE='bash' 
-DSHELL -DHAVE_CONFIG_H   -I.  -I. -I./include -I./lib   -g -O2
uname output: Linux dennis-pc 3.2.6 #3 SMP PREEMPT Tue Feb 21 03:27:27 CET 2012 
x86_64 AMD Phenom(tm) II X6 1100T Processor AuthenticAMD GNU/Linux
Machine Type: x86_64-unknown-linux-gnu

Bash Version: 4.2
Patch Level: 24
Release Status: release

Description:
        Multibyte characters are sometimes not printed correctly. UTF-8 is 
generally working as the "ä" in März in a directory listing is shown 
correctly.

Repeat-By:
        With bash 4.2:

        dennis-pc ~ $ äää
        bash: $'\303\244\303\244\303\244': command not found
        
        With bash 4.1:
        dennis-pc ~ $ äää
        bash: äää: command not found