Flame sound disappears after pressing Escape

[HybridDog]

SuperTux version: supertux2 v0.6.2-beta.1-3-gbcb66d6f9 System information: lubuntu 18.04

Expected behavior

The flame sound is hearable again after leaving the pause menu

Actual behavior

If I press Escape while I'm near a violet flame, the sound stops. If I press Escape again to continue playing, the (looped) flame sound is still gone. If I walk around to leave and re-enter the place near the flame, where the sound is played, then the sound comes back.

The problem also happens with other sounds (e.g. the screaming bomb); it probably happens with all looped sounds.

Steps to reproduce actual behaviour

Press Escape at the start in the Tower of Ghosts level

[Alasdairbugs]

this also happens if you hit a haywire, press escape, and the sound disappears. also happens on SuperTux v0.6.2-204-g3b2782343