CMake subproject ignores dependent libraries

[eyelash]

Describe the bug
If I load a CMake project as a subproject and that CMake project contains multiple libraries that depend on each other, Meson will only compile one of the libraries and ignore the other one.

FAILED: main 
c++  -o main main.p/main.cc.o -Wl,--as-needed -Wl,--no-undefined -Wl,--start-group subprojects/liba/liblibc.a -Wl,--end-group
/usr/bin/ld: subprojects/liba/liblibc.a.p/libc_src_libc.cc.o: in function `c()':
/home/elias/meson-cmake-test/_build/../subprojects/liba/libc/src/libc.cc:5: undefined reference to `b()'
collect2: error: ld returned 1 exit status
ninja: build stopped: subcommand failed.

To Reproduce
meson-cmake-test.zip
The project contains two identical main files. One of those is only there to prove that the CMake project works on its own.

Expected behavior
I expect the project to build without errors.

system parameters

• Is this a cross build or just a plain native build (for the same computer)?
  plain native build
• what operating system (e.g. MacOS Catalina, Windows 10, CentOS 8.0, Ubuntu 18.04, etc.)
  Arch Linux
• what Python version are you using e.g. 3.8.0
  Python 3.10.8
• what meson --version
  0.63.3
• what ninja --version if it's a Ninja build
  1.11.1