recovery time diodes
It looks like your graph "is wrong" because, with a forward biased voltage on the diode, the current cannot possibly reverse. This graph is not alone; I see plenty on the internet with this confusing approach. I'm calling it a confusing approach because I'm giving them the benefit of the doubt that some words associated with those graphs may shed light on what they are trying to project. Here's my favourite drawing that shows the reverse recovery time: -



Picture from this Rohm site. The green area on the left is where the diode is forward voltage biased and, the red area on the right is when reverse voltage bias has occurred.

The graph shows the general difference between a "switching diode" and a diode used for rectification i.e. something like the 1N400x series.

UPDATE

It's worth a simulation to see what is happening and I'm glad I did because, it sheds some light on the diode forward voltage remaining positive despite the current reversing and, it's clear that this is due to charge storage within the diode: -



It takes about 3 us for this 1N4003 diode to properly recover. But remember this is a simulation and not a worst case analysis.