The shield icon and red castbar do not appear to be showing up for uninterruptible casts in the TBC Classic version of KNP.

2.27.3a 2.5
enUS SHAMAN
{profile=default}
{bar_texture=ElvUI Blank,cvar_clamp_top=0.02,cvar_enable=true,cvar_overlap_v=1.1,font_face=Expressway,frame_width=110,frame_width_target=140,global_scale=1.5,guild_text_players=true,health_text=true,health_text_hostile_dmg=6,health_text_hostile_max=6,level_text=true,mouseover_glow=true,target_arrows=true}
HealthBar, CombatUpdate, NameText, LevelText, RaidIcon, [ClassPowers], CastBar, Highlight, PowerBar, [AbsorbBar], Threat, Auras, Classification, Execute, TankMode, Fading, GuildText, PlayerAnchor, [CombatToggle], ArenaID, BossMods, Quest, BarAnimation, Target