Notification observer is not being called "io.segment.analytics.integration.did.start"

[asadkazmi-mset]

Describe the bug
I updated my segment analytics to the swift version from Obj-c using SPM.
After updating I cannot find 'SEGAnalyticsIntegrationDidStart' in the scope, so after some research I found I should be using this string literal "io.segment.analytics.integration.did.start"
But after using that my observer function is not being called, previously before migration it was called with this "SEGAnalyticsIntegrationDidStart" notification

notificationCenter.addObserver(self,
                                       selector: #selector(integrationDidStart(_:)),
                                       name: NSNotification.Name(rawValue: "io.segment.analytics.integration.did.start"),
                                       object: nil)

To Reproduce
use the "io.segment.analytics.integration.did.start" as an observer and its callback will not be called as it suppose to be called

Expected behavior
This selector function(integrationDidStart()) should call if I have added the observer("io.segment.analytics.integration.did.start") correctly.

Platform (please complete the following information):

• Library Version in use: 1.5.1
• Platform being tested: iOS
• Integrations in use: Segment analytics with desitination firebase, adjust, braze