Since more than a week the insertion of special characters via the CharInsert bar (the lower one with the combobox with Standard, ... at the beginning) does not work anymore on German Wikisource. Instead of inserting the selected character the position of the page jumps to the top. The issue can be reproduced on several browsers and operating systesms. Very likely this is connected to T86715.
Example: https://de.wikisource.org/w/index.php?title=Seite:Edith_Stein_-_Welt_und_Person.pdf/148&action=edit (as logged in user)