Dynamic Content in GMail doesn't appear

Description of the issue:
Dynamic content (e.g., Google Docs comments embedded in an email) only appear in Brave if I switch tabs.

Steps:

  1. Open an email that contains Dynamic Content in Brave
  2. No Dynamic Content appears
  3. Switch to another tab in Brave
  4. Return to Gmail tab.
  5. Dynamic content loads and appears as expected

Exact URL of the website in question:
https://gmail.com

Did the issue present with default Shields settings? (yes/no)
Yes

Does the site function as expected when Shields are turned off?
No

Is there a specific Shields configuration that causes the site to break? If so, tell us that configuration. (yes/no):
No

Does the site work as expected when using Chrome?
Yes

Brave version (check About Brave):
1.29.81 Chromium: 93.0.4577.82 (Official Build) (arm64)