fix: audio issue on first spawn

[AlejandroAlvarezMelucciDCL]

Fixes #2038
Fixes #2994

[github-actions]

Windows and Mac build successfull in Unity Cloud! You can find a link to the downloadable artifact below.

Name	Link
Commit	4e16e89
Logs	https://github.com/decentraland/unity-explorer/actions/runs/13546627894
Download Windows	https://github.com/decentraland/unity-explorer/suites/34921036170/artifacts/2656760700
Download Windows S3	https://explorer-artifacts.decentraland.org/@dcl/unity-explorer/branch/fix/2994-sound-missing-on-first-spawn/Decentraland_windows64.zip
Download Mac	https://github.com/decentraland/unity-explorer/suites/34921036170/artifacts/2656745547
Download Mac S3	https://explorer-artifacts.decentraland.org/@dcl/unity-explorer/branch/fix/2994-sound-missing-on-first-spawn/Decentraland_macos.zip
Built on	2025-02-26T15:19:58Z

[Ludmilafantaniella]

Hey @AlejandroAlvarezMelucciDCL , I tested the fix by creating a new account and completing the onboarding. The music and all SFX are working correctly during the onboarding.

After jumping into Genesis City from the onboarding, I didn't hear music at first, but after going down the waterfall and coming back, I could hear the waterfall sound. Then, after going down again, I could also hear the radio music.

Additionally, I teleported to Game Expo, and the video sound played correctly. I also tested the Music Festival scene, and the music was working as expected.

Both issues (#2038 and #2994) seem to be fixed! I couldn't approve the PR since it's still a draft, but from my side, it's approved because the most critical functionalities are working properly. 🚀

P.S.: I’ll take care of creating tickets for the issues I noticed in the video.

Explorer.2025-02-26.10-25-05.mp4

Regressions for this ticket had been performed in order to verify that the normal flow is working as expected:

• ✔️ Log In/Log Out
• ✔️ Backpack and wearables in world
• ✔️ Emotes in world and in backpack
• ✔️ Teleport with map/coordinates/Jump In
• ✔️ Chat and multiplayer
• ✔️ Profile card
• ✔️ Camera
• ✔️ Skybox
• ✔️ Settings