The same code works fine with OF2.0 or with enabled partial state saving.
Probably caused by the Issue #98 fix.
Update: actually rolling back the fix doesn't help.
Fully reverting ImportConstants.java to its 2.0 state does fix the issue.
Fix #250 (reverted fix for issue 98)
Can't reproduce #98 anymore with current Mojarra 2.2.13. I've rolled back it (alternative fix was to put in view scope instead of request scope, but this feels wrong). Fix is available in today's 2.4 snapshot. Thank you for reporting and improving OmniFaces!
It is fixed, not sure why I thought that rolling back the 98 fix doesn't help.
Maybe forgot to actually build the library when checking or something.