Apparently the rule is that if a country has more than 20 cases per 100,000 then people who travel from there have to quarantine. But according to www.ecdc.europa.eu/en/cases-2019-ncov-eueea that includes:
Poland
Portugal
Czechia
Denmark
Croatia
Iceland
Cyprus
all which are apparently ok to travel back from but have more than 20 cases per 100,000.
Why?