Option key repeats next key in some apps after OS update

I have a german keyboard. On this keyboard you can access the pipe ('|') by pressing Option-7. I recently updated to Sequoia 15.5 (I don't know the old version). After the update I can't enter the pipe symbol anymore. When I press Option-7 the next key afterwards is repeated 7 times. So Option-7 and then 'a' gives 'aaaaaaa'. This initially only happend in the Terminal app but now also in the shell of my IDE (IntelliJ). iTerm is working without problems. When I press other combinations like Control-3 the next key is also repeated this number of times (like 3 times). I wasn't able to find anything on the internet, or my search phrase was poor.