Only one custom script shows in status line

Versions:
Ubuntu 10.4.2
Byobu 4.5-0ubuntu1~ppa2

Steps to reproduce:
Create file: ~/.byoubu/bin/30_first with content:
#!/bin/sh
echo Uno

Create file: ~/.byoubu/bin/40_second with content:
#!/bin/sh
echo Dos

chmod +x ~/.byoubu/bin/*

Turn on custom notifications, refresh Byobu status line with F5.

Expected results:
'Uno Dos' show on the status bar.

Actual results:
'Dos' shows on the status bar

Debugging attempts:

rm -f /var/run/screen/S-myuser/byobu.custom.*
After F5, the files with cached results appear again, and their content is correct (but nothing on the status bar)

/usr/lib/byobu/custom
/usr/lib/byobu/custom: 54: readfile: not found
(although the echo from the second script does show on the status bar)

Turning custom notifications off and on, loggin out completely and back in:
Same results