[QMYSQL] Can't build/install debug configuration

This problem started I thing from 6.6.0? I'm not sure, if I define the 
CMAKE_BUILD_TYPE:STRING=Debug it builds and installs the Release configuration, I must define it lowercase like CMAKE_BUILD_TYPE:STRING=debug then it works file.
 
A few weeks ago I exactly knew where the problem was but I forgot to save the location. Currently, only the debug and DEBUG words work, the Debug doesn't.
I'm using this command to build the QMYSQL driver:
 
qt-cmake `
    -S "C:/Qt/$QtVersion/Src/qtbase/src/plugins/sqldrivers" `
    -B . `
    -G Ninja `
    -D CMAKE_BUILD_TYPE:STRING=Debug `
    -D CMAKE_INSTALL_PREFIX:PATH="C:/Qt/$QtVersion/msvc2019_64" `
    -D MySQL_INCLUDE_DIR:PATH="${Script:MySqlServerPath}/include" `
    -D MySQL_LIBRARY:FILEPATH="${Script:MySqlServerPath}/lib/libmysql.lib" `
    -D FEATURE_sql_psql:BOOL=OFF `
    -D FEATURE_sql_odbc:BOOL=OFF `
    -D FEATURE_sql_sqlite:BOOL=OFF