Barcodescanner doesn't close camera API or JS scanner object when unloading

Steps to Reproduce

Run code in localhost (to have camera API access, need secure source)
https://zkfiddle.org/sample/2uale3u/1-barcode-scanner-not-unloading

Click the remove button

Current Result

Camera API is still open (see camera icon in url bar)
JS plugin still outputs camera event (see errors in console)

Expected Result

barcode scanner should release the camera API when no scanner is currently using it, and close active scanners on unbind

Debug Info

Root Cause

Workaround