Not quite sure what you mean by JS console.
If I inspect the Watch Now button with Firefox and look at the Developer Tools Console or Network Tab after I click it, I see this
TypeError: "o is undefined"
render https://192.168.1.3:8089/bundle.js:23
h https://192.168.1.3:8089/bundle.js:43
beginWork https://192.168.1.3:8089/bundle.js:43
o https://192.168.1.3:8089/bundle.js:43
i https://192.168.1.3:8089/bundle.js:43
E https://192.168.1.3:8089/bundle.js:43
_ https://192.168.1.3:8089/bundle.js:43
b https://192.168.1.3:8089/bundle.js:43
interactiveUpdates https://192.168.1.3:8089/bundle.js:43
_n https://192.168.1.3:8089/bundle.js:43
bundle.js:43:53646
TypeError: o is undefined
bundle.js:23:3501
render https://192.168.1.3:8089/bundle.js:23
h https://192.168.1.3:8089/bundle.js:43
beginWork https://192.168.1.3:8089/bundle.js:43
o https://192.168.1.3:8089/bundle.js:43
i https://192.168.1.3:8089/bundle.js:43
E https://192.168.1.3:8089/bundle.js:43
_ https://192.168.1.3:8089/bundle.js:43
b https://192.168.1.3:8089/bundle.js:43
interactiveUpdates https://192.168.1.3:8089/bundle.js:43
_n https://192.168.1.3:8089/bundle.js:43
_n self-hosted:1047