Backup fails when trying to include the contents of /var/lib/asterisk/sounds/en/custom

I have downloaded the edge version of the Recordings module (15.0.3.6) which was released today in response to reported issue FREEPBX-20053.

Unfortunately, the backup now fails with the error below and crashes the backup process altogether.

Apparently the module is trying to include the file ".asterisk-core-sounds-en-ulaw-1.6.1" and is looking for it in /var/lib/asterisk/sounds/en/custom/ rather than in /var/lib/asterisk/sounds/en/, where it is actually located.

"Working with recordings module
Exporting Feature Codes from recordings
Adding directory to tar: /var/lib/asterisk/sounds/en/custom
Adding file to tar: files/var/lib/asterisk/sounds/en/custom/.asterisk-core-sounds-en-ulaw-1.6.1

In FileInfo.php line 53:

/var/lib/asterisk/sounds/en/custom/.asterisk-core-sounds-en-ulaw-1.6.1 does
not exist

backup [--backup BACKUP] [--externbackup EXTERNBACKUP] [--dumpextern DUMPEXTERN] [--transaction TRANSACTION] [--list] [--warmspare] [--implemented] [--filestore FILESTORE] [--restore RESTORE] [--modules MODULES] [--restoresingle RESTORESINGLE] [--backupsingle BACKUPSINGLE] [--singlesaveto SINGLESAVETO] [--b64import B64IMPORT] [--fallback]"