There is a new feature about asset catalogs in Xcode 12 Release Notes:
Added support for Scalable Vector Graphic (SVG) image assets. These preserve their vector representation with deployment targets of macOS 10.15 or later, iOS 13 or later, and iPadOS 13 or later. (18389814)
However, the compatibility about SVG support is a little ambiguous. If we keep Preserve Vector Data option unchecked in Xcode, Can we use these SVG files on iOS 11 ?