I have a very simple angular app. with 1 map.
as of version 4.29. anywhere I click on the map a blank popup shows. I have tried everything to disable it. This only happens in an angular context and not in native javascript.
Here is a stackblitz to show the example...
I also noticed that it only happens when using the "paid" basemaps like arcgis-light-gray.
I have tried everything I possible can to disable it.
I even showed this to a few people at the Esri User conf and it still seamed to be a confusing issue. I only just now realized its only happening in angular.
I couldn't get your demo to load, but it looks like you are encountering this issue:
https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/map-wherever-i-click-it-opens-a-p...
I posted a solution in that thread that I am using that may work for you.