[sr-dev] [kamailio/kamailio] prefix_route - prefix longer than 12 characters ignored (Issue #4218)

flantel created an issue (kamailio/kamailio#4218)

### Description

If I add a prefix of greater than 12 characters in to prefix_route it does not return the correct route but instead acts as if no record was found.

### Troubleshooting

#### Reproduction

Create a prefix_route prefix of more than 12 characters and the route will not be chosen.

#### Debugging Data

There is none.

#### Log Messages

prefix_route does not seem to produce DEBUG level messages.

### Additional Information

``` kamailio 5.8.6 (x86_64/linux) ```