Try to do the output redirect a different way, fork at the very very end,.

rc_shared.sh

@@ -589,7 +589,8 @@ alias clean-trashed='find "$TRASH_ROOT" -name ".trashed*" -exec du -h {} \; -del
 eval "$(declare -F | grep -v _ | sed 's/-f /-fx /')"
 
 # Run update checker in background.
-( if [[ -d "$PROJECT_SHARED" ]]; then
+(
+	if [[ -d "$PROJECT_SHARED" ]]; then
 		git -C "$PROJECT_SHARED" fetch >/dev/null 2>&1 \
 			&& git -C "$PROJECT_SHARED" status \
 			| grep "is behind" \
@@ -614,7 +615,8 @@ eval "$(declare -F | grep -v _ | sed 's/-f /-fx /')"
 				notify-send "$title" "$message"
 			fi
 		done
-fi & ) >> $Home/Reports/env-shared.log 2>&1
+	fi
+) >> $Home/Reports/env-shared.log 2>&1 &
 
 
 ## Complete! ##