Faced with same issue https://issues-archive.asterisk.org/ASTERISK-30408:
" We encountered a rare case in which asterisk would play a completely wrong audio file during {{Playback(http://)}}, but only for certain callers…"
We no longer use Gerrit, and the patch is not currently up on Github for inclusion. Until that happens it would not be included. Looking at the history there were also comments regarding the patch itself.
The original reporter would need to follow the updated contribution instructions[1] including signing the new contributor license agreement to place it onto Github, or someone would need to fix the issue themselves and do the same by placing it onto Github for inclusion.