E Visa Vietnam - flight delayed

Hello! I’m an Austrian citizen currently in Vietnam on a 90-day e-Visa.

When I applied, I entered fixed entry and exit dates, which are now printed on my visa. My understanding is that those dates define my legal stay—not just the 90-day maximum.

Now my return flight got delayed by 2 days, so my new departure date is after the exit date on my e-Visa, but still within the overall 90-day window.

Has anyone been in this situation?

- Is this treated as an overstay even though I’m within 90 days?

- Is it better to try extending the visa for just 2 days, or just pay a fine at the airport?

- Any recent experiences with how strict Vietnamese immigration is on this?

Appreciate any insights!