Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/MicroDexed/src/commit/e31138e13566a39d7ac488f07553d0c1be5ba6ee/third-party/ArduinoJson/extras/tests/Helpers/api You should set ROOT_URL correctly, otherwise the web may not work correctly.

Holger Wirtz a0d3fee52f Added new ArduinoJson library. ... Disabled drum menus when drums not enabled. Replaced all strcpy(),strncpy(),strcat(),strncat() against strlcpy()/strlcat.		2 years ago
..
Print.h	Added new version of ArduinoJson.	3 years ago
Stream.h	Added new version of ArduinoJson.	3 years ago
String.h	Added new ArduinoJson library.	2 years ago