This is definitely a bug, but I have no idea how to solve it.
It happens when you loop from the last slide to the first, or the first to the last.
But, if you go to the second to last, and back to the last slide, the routerLink works again.
FYI, I only have one slide visible at a time in my example.
I sorta solved this by adding an <a href routerLink> tag to all my links. So, if the routerLink doesn’t work, the href takes over, but it reloads the app 
.
It sucks, but it works. Still trying to figure out how to fix this, and it ruins the routerDirection animation too.
I have reported the bug:
PS: This is related to Ion-button not working inside first ion-slide