### 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
```
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https://github.com/kamailio/kamailio/issues/4127
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