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### Description

<!-- Explain what you did, what you expected to happen, and what actually happened. -->

### Expected behavior

$var(s) = "a=1,b=2,c=3"; $var(s1) = $(var(s){param.value,b,,}); /* 2 */

#### Actual observed behavior

#### Debugging Data

``` (paste your debugging data here) ```

#### Log Messages

<!-- Check the syslog file and if there are relevant log messages printed by Kamailio, add them next, or attach to issue, or provide a link to download them (e.g., to a pastebin site). -->

``` (paste your log messages here) ```

#### SIP Traffic

<!-- If the issue is exposed by processing specific SIP messages, grab them with ngrep or save in a pcap file, then add them next, or attach to issue, or provide a link to download them (e.g., to a pastebin site). -->

``` (paste your sip traffic here) ```

### Possible Solutions

<!-- If you found a solution or workaround for the issue, describe it. Ideally, provide a pull request with a improvement. -->

### Additional Information

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

``` kamailio 5.5.4 ```

* **Operating System**:

<!-- Details about the operating system, the type: Linux (e.g.,: Debian 8.4, Ubuntu 16.04, CentOS 7.1, ...), MacOS, xBSD, Solaris, ...; Kernel details (output of `uname -a`) -->

``` debian11 ```