Cannot run apps in Creator due to wrong PATH

With Qt Creator 4.5.0-rc1, if I open any Qt 5.10.0-rc3 examples, they don't run out of the box. Project -> Run -> Environment shows a PATH starting with "C:\Qt\5.10.0\msvc2015_64\lib". If I replace that with "C:\Qt\5.10.0\msvc2015_64\bin", the app runs.

Same problem with MinGW. The run environment contains PATH=C:\Qt\5.10.0\mingw53_32\lib, but missing C:\Qt\5.10.0\mingw53_32\bin where the DLLs are.