How good is this crystal oscillator design?
Amin, Figure 1-1 in the AVR186: Best Practices for the PCB Layout of
Oscillators you linked in your question gives this layout recommendation:



Why do you do it differently? Your layout has the caps behind unnecessarily long tracks, which adds inductivity and diminishes the effect of the caps. It may even introduce weird oscillation modes of the crystal.

Please place the caps between the µC and the crystal and keep the tracks as short and wide as possible. Also, use a guard ring (local ground plane) around the crystal which is connected to ground only by one single thick lead near the µC. Do not connect other GNDs to that ring.