fix(scale): correct bar height when zoomed with dataZoom filterMode is none

Fixes #19666

Author: akashsonune

src/scale/helper.ts

@@ -128,7 +128,10 @@ export function contain(val: number, extent: [number, number]): boolean {
 
 export function normalize(val: number, extent: [number, number]): number {
     if (extent[1] === extent[0]) {
-        return 0.5;
+        // When extent collapses to a single point, only values equal to that point
+        // should be normalized to 0.5. All other values should return NaN to indicate
+        // they are out of range and should not be rendered.
+        return isNaN(val) || val !== extent[0] ? NaN : 0.5;
     }
     return (val - extent[0]) / (extent[1] - extent[0]);
 }