C++ compiler will not be replaced by the one user selected in [Preference -> Kits]

I've changed the c/c++ compiler to gcc12, but the qt create still use the default gcc to compile the project.

Reproduce Steps:

• open qtcreator
• select `Edit` -> `Preference`  -> `Kits` -> `Desktop Qt 6.2.4 GCC 64bit`
• Change `Compiler C:` to `/usr/bin/gcc-12`
• Change `Compiler C+:` to `/usr/bin/g++-12`
• create a project from the examples (`HTTP Example`)
• click the build button

Then,  the `Compile Output` tab says it still use the default `g+`,  not `g+{}-12`, and the `Issues` tab says `filesystem: No such file or directory`(because it still use system default gcc, a.k. gcc7)

Setup:

• openSuSE Leap 15.4
• run command `sudo zypper in gcc12 gcc-c++12`
• install qt via online installer with qt 6.2.4 (lts)