undefined is not an object (evaluating 'e.timeline')

[weisJ]

Browser: Safari 17.3.1 (19617.2.4.11.12)

undefined is not an object (evaluating 'e.timeline') is thrown in playState of proxy-animation.js.

In my case this happens by navigating to a linked pdf file navigating back. Every access to animation.playState causes the above error. It also isn't a once off. Every access fails until the page is reloaded.

 get playState() {
    const details = proxyAnimations.get(this);
    if (!details.timeline) # Error happens here
    ....