Hi Pavel,
While checking the provided screenshot, the element ID of the component is not getting the time of destroying. So, we need the below details that will help us to check and proceed further at our end.
1. How did you show and hide the DateTimePicker / DatePicker component in your application?
2. Whether you have rendered the DateTimePicker / DatePicker component inside the Dialog component?
3. Whether you have manually destroyed the component in any external actions in your application?
4. Code example of the component rendering and show/hide functionality
5. Issue reproducing sample (If possible).
6. Please share your current Syncfusion package version details.
7. Whether you have used router or not?
Regards,
Sureshkumar P