Hi, board info doesn't tell me much, but on the packaging I can read W05703 C4-305 NodeMcu Lua WiFi ESP8266 CP2102 2021-12-09.
I commented out all GPIO-pin related lines, and now it shows indeed the correct text, including line feeds.
Super hint 
I will now re-integrate pin by pin to see which one(s) create the problem and will feedback on this post. Thank you.