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Thanks for the bug report, I am looking to it.
Found the issue. I have missed that the icon name has been changed in FA 6 from chevron-circle-up to circle-chevron-up. This icon is used as a default when adding Scroll Top to Button List.
I am preparing a new release immediately.
Thanks again @gositepro for your valuable report, and sorry for the inconvenience.
There is a new version 3.0.2 with corrected icon names.