Syntax highlighting broken when using PCH (precompiled header)

Syntax highlighting is broken when using precompiled headers. Changing C++→Code Model→Ignore precompiled headers doesn't seem to change anything.

I've made and attached Minimal Working Example – simple CMake project – to reproduce the bug. To reproduce:

• open the project with QtCreator
• select a toolchain with gcc or clang
  <Syntax highlighting works good at this point>
• build a project
  <Syntax highlighting partially work, for some files is OK, for some is not>
• close QtCreator and run again with the same project
  <Syntax highlighting is broken at this stage>

This bug could not be reproduced with PCH disabled (CMake's variable SAMPLE_USED_PRECOMPILED_HEADER set to OFF).