Replicated issue using Inkscape 0.92.2 (5c3e80d, 2017-08-06), Win 8.1.
New document launched from within Inkscape can incorrectly show last used tool style from parent window in control bar, but still use last tool style from current (child) window).
Tools set to own style correctly show own style in controls bar.
New document launched from Windows does not show issue.
Replicated issue using Inkscape 0.92.2 (5c3e80d, 2017-08-06), Win 8.1.
New document launched from within Inkscape can incorrectly show last used tool style from parent window in control bar, but still use last tool style from current (child) window).
Tools set to own style correctly show own style in controls bar.
New document launched from Windows does not show issue.
TD