Select menu drop downs not expanding inside of Premiere Plugin SDK

I am using a Select input element in my Premiere Plugin.  For some reason, when I click on the select input, it doesn't open up. I have tried it in two separate ways, using ShadCN, and using react-spectrum components. In both cases, I saw the same behavior.

Have you seen anything like this before?

Details:

In ShadCN, and the code looks something like this:

                <Select {...register("image_size")}>
                    <SelectTrigger>
                        <SelectValue placeholder="Landscape 4:3" />
                    </SelectTrigger>
                    <SelectContent>
                        <SelectItem value="landscape_4_3">Landscape 4:3</SelectItem>
                        <SelectItem value="landscape_16_9">Landscape 16:9</SelectItem>
                        <SelectItem value="portrait_3_4">Portrait 3:4</SelectItem>
                        <SelectItem value="square_1_1">Square 1:1</SelectItem>
                    </SelectContent>
                </Select>

When I tried it with react-spectrum, I just copied code directly from the docs.

<Picker label="Choose frequency">
  <Item key="rarely">Rarely</Item>
  <Item key="sometimes">Sometimes</Item>
  <Item key="always">Always</Item>
</Picker>

This is how my shadcn code looked, inside of the Premiere plugin.  When I click on the "Landscape 4:3", nothing happens

 
When I run the same code in a browser, it opens up fine.