How to reproduce : 

• Click on the Integrator menu 
• Select Content types in the ribbon
• Select the "modification" menu
• Choose an attribute and edit it 

1/ Bug on validators : 

• Create a default validator
• Insert a regex and an invalid text
• Reboot the app
• Edit the attribute a second time
• The content of the validator has disappeared

2/ Bug on enumerators : 

• Create a custom enumerator
• Fill the fields
• Click on save

This exception occured : 

Date: Thu Apr 23 16:59:44 CEST 2020 (1587653984223)
Thread: http-nio-10000-exec-3
Message #: 2253
Level: ERRORNDC:
Category: sitemap.handled-errors
Message: No pipeline matched request: www/ametysicon-write13 at <map:mount> - file:/E:/Dev/Ametys/kernel/01_Runtime/master/main/kernel/sitemap.xmap:182:109
Location: org.apache.cocoon.util.log.SLF4JLoggerAdapter.error(SLF4JLoggerAdapter.java:50)
Thrown: