Framework search path not set in CMake 3.19

When using a third-party macOS framework, I set CMAKE_XCODE_ATTRIBUTE_FRAMEWORK_SEARCH_PATHS so Xcode can find the framework and link it to the executable. In CMake 3.18.4, it worked fine, but in 3.19.0-rc2, I get a linker error stating it can't find my framework. When I look in Xcode, the Framework Search Path field in the executable target is blank. Here's a minimal project to repro the issue:

Use this CMakeLists.txt:

cmake_minimum_required(VERSION 3.18)

project(Hello)

set(CMAKE_XCODE_ATTRIBUTE_FRAMEWORK_SEARCH_PATHS /path/to/frameworks)

add_executable(add add.cpp)

And a dummy source file for the executable:

int add(int num1, int num2)
{
    return num1 + num2;
}

int main()
{
    add(1, 1);
    return 0;
}

Generate an Xcode project: cmake -G Xcode -B build

The Framework Search Paths field is blank. See below:

If you install CMake 3.18.4 and re-run CMake, the expected /path/to/frameworks appears in that field.

Reproduced with Xcode 12.1, 11.3.1, and 10.2