Reproduction steps:
1) open the dojo https://dojo.telerik.com/uKECIxUv based on https://docs.telerik.com/kendo-ui/knowledge-base/numerictextbox-decimals-precision-runtime-change
2) (important) trigger the validation - e.g. try to type more decimals than the initial
3) Click the Change decimal button
Actual:
You can enter 2 decimals max
Expected:
You can enter 3 decimals max