Did try with preview 153 and the problem persists. Here is a gist to illustrate the issue: https://gist.github.com/apinet/9bde393af5fbeebf74df43e4b878528f In the first input field, the conditional ui is triggered but not for the second one hosted in a custom element... Maybe I missing something :/

Many thanks for the prompt reply! I'm going to try with the preview 153. If the problem persist, I will create a gist to be more specific on this.