Chromium API Bug

background.js

let c = 0

// removing the filter causes it to act normally
chrome.webNavigation.onCompleted.addListener(()=> console.log(++c), {url: [{urlEquals: `https://github.com/`}]});

// commenting this out will cause the above listener to only fire once
chrome.webNavigation.onCompleted.addListener(()=> console.log(++c));
// leaving it in will cause both of them to fire twice

manifest.json

{
	"manifest_version": 2,
	"name": "Bug",
	"version": "1.0.0",

	"background": {
		"persistent": false,
		"scripts": ["background.js"]
	},
	"permissions": [
		"webNavigation"
	]
}

Navigate to https://github.com and check the background page console.