Bug: UI Fabric icon does not appear anymore

Summary

We have downloaded your spkg package for "ScrollToTop" feature. Everything was working fine and suddenly we observed that the icon is not appearing on any modern SharePoint site. The shape and functionality works fine but the icon doesn't appear. We have tried different Office Fabric icons, but still the same.

Could you please help us in fixing the issue?

Your environment


Tenant Release	Standard Targeted
Extension version	v0.0.4
Deployment	Tenant App Catalog and install one whole Tenant Tenant App Catalog and install per site collection Site collection app catalog

Current behavior

Deploy and install the component into the Tenant App Catalog
Keep default properties or customize them
The button is visible but not the icon

Expected behavior

The icon should appear

Additional information

Expand for output related to your SharePoint Environment