No, that's still under investigation. The overall reported number of thromboembolic issues does not exceed the occurrence rate observed in general population, but there are questions raised about one particular batch of the vaccine (ABV5300 which has been delivered to 17 European countries). It all started in Austria, where a 49 year old nurse suddenly developed multiple thrombosis and died shortly after receiving her jab, and her 35 year old colleague nurse from the same clinic was hospitalised with pulmonary embolism (which is usually caused by thrombosis) after receiving her vaccine from the same batch. Denmark reported numerous cases with serious thromboembolic issues as well (including one death, reportedly - but not officially confirmed, I think), and several other countries reported similar isolated severe side effects too, so this is a precaution until it is being investigated.