Hello Daniel,
Yes, i have attached Logs on this email, please check out it.
Regarding to t_set_fr() function, i use it in several places within my kamailio scripts without any issue, I only noticed this behavior on this particular case.
I don't know if this can be relevant but I have tested t_set_fr function with the following parameters => t_set_fr(,2000) and it entered on failure route after 2 seconds.