### Description

Unexpected Behavior from transformations, psuedo variables, and topos.

Topos is in use for topology hiding I'm not sure if this is part of the problem as I can't easily test this in the current environment, although I do know indexes should work with $hdr() psuedo variables.

*Issue 1* ``` Record-Route: sip:a@a.com,sip:b@b.com,sip:c@c.com

$(hdr(Record-Route)[0]) results in "sip:a@a.com,sip:b@b.com,sip:c@c.com" ``` Expected result would be sip:a@a.com

I've also tested using index 1 incase 0 was equivalent to *, same results.

Which lead me to the second issue.

*issue 2* ``` Correct: $(hdr(Record-Route)[*]) results in sip:a@a.com,sip:b@b.com,sip:c@c.com

Correct: $(hdr(Record-Route)[*]{re.subst,/,/|/g}) results in sip:a@a.com|sip:b@b.com|sip:c@c.com

Incorrect: $(hdr(Record-Route)[*]{re.subst,/,/|/g}{param.valueat,0,|}) results in some random string pulled from part of the Record-Route header ``` Expected result would be sip:a@a.com

### Possible Solutions

TBD

### Additional Information

* **Kamailio Version** - output of `kamailio -v`

``` version: kamailio 5.8.2 (x86_64/linux) flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, MEM_JOIN_FREE, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLOCKLIST, HAVE_RESOLV_RES, TLS_PTHREAD_MUTEX_SHARED ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_SEND_BUFFER_SIZE 262144, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB poll method support: poll, epoll_lt, epoll_et, sigio_rt, select. id: unknown compiled with gcc 10.2.1 ```

* **Operating System**:

``` Distributor ID: Debian Description: Debian GNU/Linux 11 (bullseye) Release: 11 Codename: bullseye ```