The rennet creating does not proceed. The use of thistle and stomach does not give effect. Other processes in the brew kettle are OK. Tested on version 4.1.3.100 and 4.1.3.200

Screenchots:

https://i.imgur.com/3iOGmqT.png
https://i.imgur.com/WCECrbp.png
https://i.imgur.com/SGRz1Pa.png
https://i.imgur.com/BgshrZ0.png
https://i.imgur.com/3iOGmqT.png

Have you cleared out your brewing.json file? If so, remove your heat source and then put it back.

Thank you for your help, cleaning the file helped.