Expanding into the EU is a minefield, especially when your site starts flagging...

https://wiki-quicky.win/index.php/Why_Does_Seznam.cz_Matter_for_SEO_in_the_Czech_Republic%3F

Expanding into the EU is a minefield, especially when your site starts flagging hundreds of hreflang errors overnight. It’s a classic bottleneck that kills your rankings before you even launch