Received Failure Notifications

[RobbyMichelsPinch]

Describe the bug
When trying to receive background notifications (silent notifications), nothing happens. When we open de app again, in the debugger we receive a exception, Connection 6: received failure notification. But when we send normal notifications (with an alert: "" attribute, everything works just fine)

Exception or Stack Trace
Add the exception log and stack trace if available

To Reproduce
Steps to reproduce the behavior:

• start up the app.
• soft close the app
• Send a background notification: { "aps": { "content-available":1 }, "data": { "type": "test" }}
• Open the app
• check Xcode debugging, it should contain a message: Connection x: received failure notification

Code Snippet
Add the code snippet that causes the issue.
{ "aps": { "content-available":1 }, "data": { "type": "HEALTH_ISSUE_CREATED" }}

Expected behavior
Nothing should happen, when connecting a device to Xcode, after sending the notification, open the app, a message should pop up with:
Connection x: received failure notification

Screenshots
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Setup (please complete the following information):

• OS: [e.g. iOS 13.x]
  iOS 14.5.1
• IDE : [e.g. Xcode 11.x]
  Xcode 12.5.1
• Version of the Library used
  3.1.3

Information Checklist
Kindly make sure that you have added all the following information above and checkoff the required fields otherwise we will treat the issuer as an incomplete report

• Bug Description Added
• Repro Steps Added
• Setup information Added