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"panel-background.svg" should be updated to work on Plasma 5
According to the official document, since Plasma 5, all "[prefix-]" elements should include all potential borders. However, currently we only have "north-bottom", "east-left", "south-top", and "west-right", with other borders missing, which would cause the panel background to fallback to the default theme in KDE Plasma.

"QTStep Classic" themes do include all potential borders, and they work well, while "QTStep" themes do not.
I've got the same issue after update plasma from 5.21.5 to 5.22.5. Before all was fine. (Gentoo)