To reproduce:
1. Open attached project "AudioPlayableMissingSamples.zip"
2. Open "SampleScene.unity" scene
3. Enter Play mode
4. Listen as the first audio sample sounds like its beginning is cut off
5. Pressing the Button in the game window repeats the Timeline again

Expected result: the sounds should sound identical
Actual result: if the sound starts at the first frames of the Timeline, its begining is cut off

Reproduced on:
2017.4.0f1 2017.4.31f1 2018.4.5f1 2019.1.12f1 2019.2.0f1 2019.3.0a11

Notes:
- If the audio samples are dragged a couple of frames forward in the timeline, all the sounds sound identical