Dear,
Since the update to hazel 4, i had several crashes during the settings of some new rules, particularly during the creation of some custom text pattern (update a pattern and create a new one by simply drag n drop a custom text)
Other thing : use add tags and dynamic tag, and drag n drop a custom pattern in the name field instead of the text will delete the custom pattern in the list (mistake from my side ok, but the pattern is no more present in the list). Close the rule and reopen it to refresh the display.
I have activated the debug mode to have a more detailed log to post.
Best regards