Unable to use DxTextBox in DxDropDown within OffCanvas

Question

I'm coding in C# using DevExpress Blazor, and I'm facing an issue where I can't input text when using DxTextBox and DxComboBox within DxDropdown placed inside an OffCanvas. However, checkboxes work fine. Below is an image of my web page: thecolored arrow represents DxDropdown, and inside it is DxTextBox. The blue arrow represents OffCanvas.

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I tried moving DxDropdown outside of OffCanvas, and it worked fine.