We do not do any audio time stretching when doing time remapping. As we also use the audio to keep track of time passed, we should always pass the actual timestamp we are starting playback from. The issue was that the old logic would try to undo time remapping on cfra. However cfra is already correct and is not remapped. I'm guessing that this changed at some point and we forgot to fix it up in the sound code. Pull Request: https://projects.blender.org/blender/blender/pulls/141288