This situation happens randomly, I create different worlds, and in some places it also happens
The triggers I use

[[triggers.dimension]]
priority = 100
resource_name = [ "0" ]
identifier = "overworld"
[[triggers.time]]
priority = 200
time_bundle = "day"
identifier = "day"

Demo video
https://www.youtube.com/watch?v=vuKjGNFnVtw

This is a detailed test video
https://youtu.be/omD5YRBtW-M

I have identified the cause, it is due to Endorium mod
https://www.curseforge.com/minecraft/mc-mods/end-rebornd

I hope you can test it yourself. These two mods are really important to me, and this error is really strange. I don't know which side caused the problem, only you can solve it because Endorium mod has stopped updating!

Recommended Test Seed: 1
Transfer to this location: /tp -520 72 103
Open the debugging information display and move around nearby chunks. You will find that some chunks cannot play music, as if they have lost focus and paused the music

@TheComputerizer

Try disabling the PAUSE_WHEN_TABBED debug parameter and then the channel parameter for pausing when there is a nearby jukebox. This should narrow down what it's getting paused from. If music is still getting paused then it might be actually pausing the game.

PAUSE_WHEN_TABBED = false
I disabled this parameter for testing from the beginning. You can watch my testing video,
I don't know why this happens when these two mods exist at the same time, but this mod has stopped updating. Only you can find the reason. These two mods are really important to me, and your music mod is the best I have ever seen

Using this mod list, I entered the world and went to a chunk where music couldn't play. Then I removed the "EndReborn" mod and re-entered the world, and the chunk that couldn't play music was restored. I'm not sure if you can understand this, as I used Google Translate.

I conducted multiple tests again and confirmed that this issue only occurs when the Endorium mod is also present. However, when I use other music mods, the problem doesn't happen, so it might be an issue with Music Triggers. I sincerely hope this bug can be fixed because your mod is truly excellent and amazing!