Same problem with real device: macOS 11.4 iPhone XR 14.4.2 Safari 14.1.1 (16611.2.7.1.4)

Device update to iOS 14.6 has NOT fixed the issue for me.

Thank you, guys. Works fine for me on real device with iOS 14.6 and Safari Technology Preview Release 125 (Safari 14.2, WebKit 16612.1.15.1.12)