notifications sent by apps from the safe folder do not have content. the notification content is hidden by default, even on the lock screen. in the safe folder settings, the content can be enabled, so notifications are displayed with content as usual.

Android 10 (One UI 2.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Biometrics and security
Step 3:  Tap on  Secure Folder
Step 4:  Tap on  Notifications and data
Step 5:  Enable or disable  Show content
  1. Open the Settings
  2. Tap on Biometrics and security
  3. Tap on Secure Folder
  4. Tap on Notifications and data
  5. Enable or disable Show content

Samsung Instructions
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