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Regarding: Themeable Button Style settings:

Within Web Builder: Icons are using Boarder Color settings, rather than Icon Color settings.

When published: icon colors are correctly using the Icon Color setting.

It seems to work correct for me.
Are you using the latest update?
Do you have a DEMO project?

For further details about how to share a project file, please see this FAQ:
viewtopic.php?f=10&t=82134