SDK does not fire Prebid impression event URL in DISPLAY interstitial

[elq81hc]

Describe the bug
SDK does not fire Prebid impression event URL in the DISPLAY Interstitial

To Reproduce
Steps to reproduce the behavior:

1. Enable Events feature on Prebid Server
2. Run example "In-App Display Interstitial"
3. Check whether the Prebid impression event URL fires or not

Expected behavior
Prebid impression event URL (ext.prebid.events.imp) should be fired when the ad is shown

Smartphone (please complete the following information):

• Device: Pixel 8 Pro Simulator
• OS: Android
• Version: API 34

Additional context

• PrebidSDK version: 3.0.0
• Issue does not occur on the "Medium Phone" simulator

[elq81hc]

Hi @YuriyVelichkoPI, @mdanylov-sigma please take a look at this issue.

From my understanding, the issue is caused by restarting the creativeVisibilityTracker when WebViewBase.onWindowFocusChanged is called. This clears the visibilityHandler which has a visibility runner in queue. While this issue does not happen on VIDEO interstitial, InterstitialView.onWindowFocusChanged only performs pause/resume on the underlying video.
Could we remove AbstractCreative.changeVisibilityTrackerState to make the behavior of display same as video?
I am not sure why this issue can not be reproduced on the Medium Phone emulator.

[elq81hc]

Hi @YuriyVelichkoPI , @ValentinPostindustria, please review if it is an issue

[mdanylov-sigma]

Hey @elq81hc! Thanks for highlighting this, we're going to check the described scenario!

[elq81hc]

Hi @YuriyVelichkoPI may I know your though on this issue?

[YuriyVelichkoPI]

Hi @elq81hc ! Sorry for the long silence, have a crazy week.

Yep, it definitely looks like a bug. From the @mdanylov-sigma comment, I supposed that the ticket was considered in the Mobile PMC and prioritized for the work.

Do you know if this bug is actual for iOS?

[elq81hc]

Hi @YuriyVelichkoPI! Thanks for looking at this issue.

IOS does not face this issue. Tested on device iOS 15.8 and emulator IOS 17.3

BTW, how do I register to join Mobile PMC?

[YuriyVelichkoPI]

If your company is a Prebid.org member, ask Katie Morgart kmorgart@prebid.org to add you to Prebid Mobile PMC meetings.