Apple Watch Icon Not Display on Notification

I have an iPhone & iPad app that does not contain an Apple Watch app. When the app receives a push notifications, and my phone is locked, I receive the notification on my Apple Watch. However, the image in the notification is missing:

When I swipe down on the watch, the image is also missing on the received notification. On the phone, the icon displays correctly. My watch is a Series 5 (44mm) A2095. Below is all the icons present in my asset catalog. Please help!

Same problem here. I can't find any information about this issue, even on Stackoverflow.

Update: My problem is solved after updating my iPhone to iOS 15.5

Apple Watch Icon Not Display on Notification
 
 
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