You’ve changed from the original subject.
CDRs for simple leave from queues worked in 18.104.22.168, so finding when it stopped working might help the debugging.
Bug fixing will tend to get prioritised based on whether a patchl or fault mechanism, is provided, and by the number of people seriously affected. The severity is supposed to reflect that latter, but most people classify by the effect on themselves and people rarely update it.
Having other people reporting me too’s would increase the effective priority.
There is a warning about an unexpected operation on a zombie in that bug report. Are you sure that you are actually showing a transfer case there, as CDRs will be suppressed for for the zombie channel left over from before the transfer.