Looks like recent Chrome privacy improvements made in version 83 cause Atlaskit Renderer component to throw unhandled JS exception (that breaks UI of entire page) if opened in incognito mode. Workaround is to enable 3rd party cookies (by clicking on new ‘eye’ icon). Below is the top of stack trace from Chrome Dev tools.
Uncaught DOMException: Failed to read the 'localStorage' property from 'Window': Access is denied for this document. at http://localhost:3000/static/js/bundle.js:102930:54 at Module../node_modules/@atlaskit/emoji/dist/esm/api/internal/UsageFrequencyTracker.js (...) at Module../node_modules/@atlaskit/renderer/dist/esm/ui/ExtensionRenderer.js (http://localhost:3000/static/js/bundle.js:145071:81) (...)
I thought I’ll report it as a post on Community so other app developers are also aware of this problem (please let me know if there’s more appropriate place to report such issues)