Custom sounds from resource pack loop

I made a resource pack and put a song in it. Here is the JSON code I used:
{
"custom.rs": {
"category": "master",
"sounds": [
{
"name": "custom/rs",
"stream": false
}]
},
"custom.rsi": {
"category": "master",
"sounds": [
{
"name": "custom/rsi",
"stream": false
}]
},
"custom.rsee": {
"category": "master",
"sounds": [
{
"name": "custom/rsee",
"stream": false
}]
}
}

The JSON is placed in the following folder: ...minecraft/resoursepacks/<Pack Name>/assets/minecraft
And its name in the folder is: sounds.json

When I am in game, and use the command "/playsound custom.rs @a ~ ~ ~ 1.0 1.0 1.0" the song plays perfectly fine. However, after the song ends, it will continuously loop.

EDIT: Upon further investigation, I realized it only loops when the song ends while you have a command block GUI up. After exiting from the command block, the song will loop. This might occur in other GUI's.