Missing some source codes for WebKit git

Target: https://github.com/WebKit/WebKit with commit a9adb787a00f51002f150168c9a25ea1fcd1d2f0
Using CodeQL with following commands: `Tools/Scripts/build-webkit --gtk --release`
Compiler: Pre-built version of clang12 (set `export CC=clang; export CXX=clang++` before compilation)
OS: Ubuntu 20.04 x64
CodeQL Version: 2.7.0

Although the compilation process is completed and a CodeQL database is created, CodeQL seems failed on analyzing some source codes.
The path of missing files doesn't exist in `database-create-DATE.log` and aren't shown in ql query results(e.g. `from File f select f.location()`). but `build-tracer.log` includes archiving logs for these files.

For example, `Source/WebCore/svg/properties/SVGPropertyAnimator.h` is missing and `Source/WebCore/svg/SVGZoomEvent.cpp` is missing in database while its header file, `Source/WebCore/svg/SVGZoomEvent.h`, exist in the database.