Poland’s ski jumping difficulties ahead of the Winter Olympic are continuing with world champion Piotr Zyla positive for the coronavirus just two weeks before the start of the Beijing Games. The Polish skiing federation said the 35-year-old Zyla was positive shortly before the start of the World Cup weekend in Germany’s Titisee-Neustadt. Zyla claimed a surprise world title in Oberstdorf in February 2021 and is the second member of the Polish team to contract the coronavirus after former Four Hills Tournament winner Dawid Kubacki. Both jumpers must return four negative PCR tests to be allowed t…