air travel – Wrong nationality on boarding pass due to IT error

TL;DR How can I make sure I board my flight when the boarding pass shows my nationality wrong due to an IT error?

I’ve just checked in online for my flight tomorrow and upon checking my boarding pass details, it looks like my nationality is wrong (ISO 3166 alpha-2 code is obviously wrong). I am 100% sure it was not my mistake, in fact i can access the details and technically change them, but they are already correct, and my changes are not being reflected in the boarding pass that is being generated.

The customer service department is closed so I can’t reach them. I have screenshots of the form and I sent a support email, but I don’t expect to hear back from them until my flight first thing tomorrow.

I am flying from the UK into the EU.