角度材料对话框 - 固定位置元素高度随机切断

I need to add an element inside of an Angular Material dialog that has it's own height and will be unaffected by the dialog (imagine a custom dropdown). Whenever I do this, the dialog gets chopped off at the bottom, but very oddly - not directly at the bottom of the dialog. It's allowed to go about 20px beyond the bottom, and then gets randomly cut off.I need to add an element inside of an Angular M