Issue relates to the loadeddata events on <audio> and <video> HTMLMediaElement and is specific to Safari/WebKit on iOS 17.4 Beta. The issue does not seem to repro on Safari 17.4 on Sonoma 14.4. The loadeddata events are not firing on page load. See the following https://jernoble.github.io/samples/bin/audio/mp3-without-extension.html
rdar://124079735
Pull request: https://github.com/WebKit/WebKit/pull/25762
Committed 275997@main (c0a2b3040d2d): <https://commits.webkit.org/275997@main> Reviewed commits have been landed. Closing PR #25762 and removing active labels.