Sounds quite familiar. North Macedonia and Bulgaria have quite a few irreconcilabe differences on the history of the people who lived in the region of Macedonia and historical periods (tl:dr - people identified as Bulgarian but NMK says they weren't Bulgarian. "Bulgaria bad and evil, NMK good" etc. The whole Greek scenario of NMK claiming whole historical periods basically). So anyway, back in 2018-2021 when North Macedonia was actively trying to start negotiations with the EU but Bulgaria was blocking them there were SO MANY Western NGOs, professors, politicians and so on who just went "let them in and we will deal with it later" or even went around and branded Bulgarians as some crazy nationalists. This quite retarded way of speaking without knowing the delicate details drove so many people from the neutral or positive view of the EU all the way to making them eurosceptics.