Different behaviour on field of type string with format date in array of objects vs object

**Describe the bug**

Given is following schema where one date property is in the root object and another date property is nested inside a list of objects

schema = {
type: "object",
properties: {
validators: {
type: "array",
items: {
type: "object",
properties: {
name: {
type: "string",
title: "Name",
description: "Name"
}
},
required: ["name"]
}
},
currentUserCanValidate: {
title: "Aktueller Benutzer ist validator?",
type: "boolean"
},
validations: {
type: "array",
items: {
type: "object",
properties: {
validationDate: {
title: "**date in array of objects**",
type: "string",
format: "date"
},
validatedBy: {
title: "validiert von",
type: "string"
}
},
required: ["validationDate", "validatedBy"]
}
},
nextValidation: {
type: "string",
title: "**date in object**",
format: "date"
}
}
};

When I use react with material renderer, then I expect, that the formats in UI and the presentation of the DateField is in both cases the same, but it renders different formats:

**To Reproduce**
Copy the schema and render the form.
**Expected behavior**
The date controls schould look the same and not differnt

**Screenshots**

Further questions:

How can i influence the UI Format? I know that the json schema date is per specification in format yyy mm dd... but I guess that the UI can render differently while just storing the date in that format.

Do you have working examples which show how to change the date format in ui?