So I've made a hundred Kendo Grids with MVC so far and I have zero success with globalization and validation. To give a little bit more details: If we look at the demo presented here https://demos.telerik.com/aspnet-core/grid/globalization and the "Unit Price" column. You can clearly enter only numerics with only 1 delimiter depending on the culture. If you try to enter any non-numerical letter, it doesn't let you. Neither does it let you insert more than 1 delimiter (",,,,,,") or the wrong delimiter. So there's some kind of "on the fly validation" going on.
My grids don't have this. For example I have decimal columns and I can enter all letters, even non-numerics. I can type "03,,.awd923..." in a decimal column within the grid. What I have tho is culture. I think the culture I have set up works properly because when I check the kendo.cultures within JS console I can see all the info of the current culture (check image in attachments for more info).
Here's an example of one of my grids: