The following never happened before November 2021 update. Afther the update, while I'm working with a report page, some text elements randomly (e.g. when another visual selected) changes visible font size to minimal. Then (after some clicks on the page visuals) back to normal. It happenes at least with the following: card visual data label, line and stacked column chart axis Y (both, left and right). The problem probably related to the fact that all visuals on the page are grouped into groups (on the Selection pane).