I've this simple main.toml:

[triggers]
[[triggers.season]]
identifier = "spring"
level = "0"
priority = "2"
fade_in = "80"

[songs]
[songs.season2_spring]
triggers = [ "dimension-overworld" "season-spring" ]
play_once = "2"

When I'm in the overworld, the song is played in a loop, and the fading isn't taken into account after the first iteration of the song.

Of course, the spacing is correct on my side, looks like github formatting put everything on the left.

And it's doubled square brackets because I've multiple season triggers, but the behaviour is for everyone.

This has been fixed in 6.2