Ello ello ello this is the fuel flap police here, we've had some completes of someone taking loads of photos ??
I've had a look online and looks like this is a weak part with the latest new
Ibiza models, all the previous models had the fuel flap & hinge moulded as one piece, but this new model since 2017 has the hinge housing separate from the actual fuel flap that clips attaches to hinge housing.
The VW Polo also has issues regarding the fuel flap, where it won't open properly or doesn't line up correctly.
Hinge housing assembly
Part number 6F0 809 906C
Fuel flap cover
Part number 6F0 809 905
It's possibly a poor weak design that VAG may address in the near future with an updated/upgraded stronger part.
That's what most car manufacturers have done in the past, if they get loads of complaints for the same fault/issue with a certain part.
I remember many moons ago now when Ford had issues with some of their cam belts on the diesel engines, that were prone to snapping on the MK5/6 Escort vans and Transit vans, also on some MK1 Mondeo's.
Ford brought out a reinforced cam belt and replaced the plastic idlers with metal ones.
Also weak front suspension bushes were a known issue on the MK1/2 Ford Sierra's, so upgraded reinforced bushes were made.
On the Toyota GT86 they're known to have leaking rear light clusters, and idling problems on the early models from 2012.
I think there's been a recall on those issues for the GT86.
With the VAG they've had issues with ECU updates, water leaks, timing chains snapping, TSI engine's burning too much oil, electronic problems, some of this has been recalled but not all.
Like I say hopefully VAG will recall the issue with this poor designed fuel flap, or someone might come up with a modification to fix the issue ?
Hope this helps
Si