Shouldn't be, the client handles it but who knows what the relay do. Mere kind 1s with a link that amethyst renders properly and links on other clients although coracle plays audio. Take a look at the relays 📝 is on. Around 60 there tho 30 active at the moment.

https://nostrcheck.me/media/public/nostrcheck.me_aa927e3f75a55a6492611c2804175241fdf656d63a673454.webp

See if you can see for example this one:

nostr:nevent1qqspduxyzzx4n35lvdrmg9rzp5v0rn343pmpsz26hcmjluk5z56szhgpz3mhxue69uhhyetvv9ujuerpd46hxtnfdupzpnnv45p0lwzkddez277wexz69lmldqmgylpx4p2f8h8psuy45l0uqvzqqqqqqyzvz5z5

Also amethyst started to support m3u8 from some version on. Can't remember which one but if you are on the newest should work. I still drag on 777. Cant keep up with Vitor.