shoelace: sl-details open="true" fails in beta.28+

Describe the bug Loading a sl-details with it’s body open on init worked prior to beta.28. See this video:

Frombeta.28 on it’s initialized with only a portion of the body content visible. On subsequent open/close class it’s fine:

Expected behavior Inits with body content fully visible with open="true".

Desktop (please complete the following information):

• OS: Web
• Browser Chrome
• Version 88