Tell us what you are trying to do?
First issue is with using a plugin for HTTP2 push/Defer/Async to improve performance and speed:
https://wordpress.org/plugins/http2-push-content/
Second issue is with a Google Tag Manager plugin:
https://wordpress.org/plugins/duracelltomi-google-tag-manager/
Both plugins were installed within a few days of each other. The problem apparently is limited to slightly slower internet connections (4G and lower). On our ajax enabled "dealer locator" map view, when a search is performed, the spinner shows and spins endlessly without showing results.
When we first saw this, we disable the most recent plugin, HTTP2 Push Content. This did not solve the problem. After many failed attempts, we then disabled Google Tag Manager for WordPress which did have tags related to this map. This solved the problem. When I reactivated the HTTP2 Push plugin, the problem immediately presented.
I've tested quite a bit, and these plugins both seem to cause the endless spinning issue and it does only seem to be an issue on slower internet connections.
Is there any documentation that you are following?
I searched both HTTP2 and GTM, but haven't found anything.
Is there a similar example that we can see?
Probably not.
What is the link to your site?
Currently set to private. Please provide a static IP address or a window of time to set it to public.