Videosphere not working with Cordova/Capacitor JS

Description:

I've created a simple vr app using Cordova following the guidelines on your website but when I click on the VR button I get this error:

webvr-polyfill.js:382 Uncaught (in promise) TypeError: Failed to execute 'exitFullscreen' on 'Document': Document not active
    at O (webvr-polyfill.js:382)
    at webvr-polyfill.js:3039
    at new Promise (<anonymous>)
    at w.v.requestPresent (webvr-polyfill.js:2953)
    at HTMLElement.value (a-scene.js:337)
    at i.onEnterVRButtonClick (vr-mode-ui.js:72)
    at bind.js:12
    at HTMLButtonElement.<anonymous> (vr-mode-ui.js:193)

and then all I see is a grey screen behind the VR canvas. When I try to exit VR mode the video disappears altogether.

• A-Frame Version: 1.2.0
• Platform / Device: Android
• Reproducible Code Snippet or URL:

Start by reproducing the A-Frame 1.2.0 case on Android with Cordova or Capacitor, using the reported VR-button flow. Trace the failure through webvr-polyfill.js, a-scene.js, and vr-mode-ui.js, including the exit path. Done means entering VR no longer produces the Document-not-active error or a grey screen, and exiting does not make the video disappear.