bash 4.0.x sourcing

[Gabor Z. Papp]

Hello,

$ bash --version
GNU bash, version 4.0.17(1)-release (i686-pc-linux-gnu)
Copyright (C) 2009 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
<http://gnu.org/licenses/gpl.html>

This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

$ ls -l /bin/sh
lrwxrwxrwx 1 root root 4 Apr 27 08:51 /bin/sh -> bash

$ cat bla 
#! /bin/sh
cd /tmp
rm -f aaaa
echo "id" > aaaa
if [ -f "aaaa" ]; then echo "sourcing aaaa"; . aaaa; fi

$ ./bla 
sourcing aaaa
./bla: line 5: .: aaaa: file not found

$ bash ./bla 
sourcing aaaa
uid=101(gzp) gid=101(gzp)
groups=101(gzp)

Is this "file not found" problem known in bash4?

Using ". ./aaaa" solves the problem too.