there something that always worked for me, this works all the time. I think the dev should just insert this line in the main code anyway since, either it does the work of unfreezing animations or it doesn't do anything and nothing bad happens really.
troubleshooting:
+ if videos are not playing, then edit pixi,js (inside www/js/libs/) with the following
video.setAttribute('preload', 'auto');
add the line below var video = document.createElement('video');
source:
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