As to the second thing;
This appears to be true for most themes that previously provided color styles to the dolphin icon.
It seems they are still applied to your home directory icons … but dolphin itself (such as in the taskbar or shown in alt+tab, etc) will be the stock dolphin icon from the theme (blue usually).
In my case … I just manually edited the files for Papirus, as it had the same issue.
(in the case of papirus it was these files)
/usr/share/icons/Papirus/22x22/apps/org.kde.dolphin.svg
/usr/share/icons/Papirus/48x48/apps/org.kde.dolphin.svg
/usr/share/icons/Papirus/16x16/apps/org.kde.dolphin.svg
/usr/share/icons/Papirus/32x32/apps/org.kde.dolphin.svg
/usr/share/icons/Papirus/64x64/apps/org.kde.dolphin.svg
/usr/share/icons/Papirus/24x24/apps/org.kde.dolphin.svg
