Regression in m.notice multiline support

[ara4n]

Filed originally as matrix-org/go-neb#226, but it looks like goneb is emitting \n in the right places, but riot develop is failing to display it for some reason:

It seems to work on 0.13. I wonder if it's the emoji breaking it somehow?

[ara4n]

looks like #6523, possibly a stickerpack regression?

[t3chguy]

I think its more matrix-org/matrix-react-sdk@4f4441f

[t3chguy]

but yeah its the same as #6523

[lampholder]

Closing because
#6523 has more details