I did some additional investigating by setting up a simple static page with the following HTML. From my testing, it appears it could be a regression introduced by Apple for apps that launched recently and have app ID's beginning with 644.
Here's the HTML I used for testing:
<html>
<head>
<title>Test</title>
<meta charset="UTF-8" />
<meta name="apple-itunes-app" content="app-id=6443885102" />
</head>
<body>
<h1>Testing Smart Banner</h1>
</body>
</html>
The app ID included above (6443885102) is the app ID for my app, and opening the above HTML on an iPhone reproduces the same empty disappearing banner bug described in this forum post.
I then swapped my app ID for Reddit's (1064216828) and voila, it worked.
Since we just recently launched in the App Store a few weeks ago, I was curious if I could reproduce the issue on other recently launched apps. I went to the "Best New Apps" section of the app store and copied a few app IDs to test them out:
6443725564 - launched Dec 22, 2022. Same issue as described here.
1643213477 - launched Nov 1, 2022. Works.
6443868502 - launched Oct 24th, 2022. Same issue as described here.
1556819721 - launched Nov 9th, 2022. Works.
1542769365 - launched Nov 10th, 2022. Works.
As you can see, the apps beginning with 644 had the same behavior described in this forum post. I also tested 6444037159 from @jmurti above, and confirmed the same behavior as the other 644 app IDs. It's obviously not enough of a sample size to confirm that all 644 apps are having this issue, but felt worth sharing.
My bug report via Feedback Assistant was marked as Resolved without a response from Apple, so I'm hoping by sharing my findings here, it will get more visibility and/or someone from the community is able to help resolve this bug.
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Experiencing the same issue. Feedback number: FB11892720