I found the next problem: having Qt 5.13.0 on Linux x64 with GCC 7.4.0 and compiled QtCreator 4.10.0-rc1 (moreover, the same issue was with the last beta based on 4.11), I can not open ui files inside QtCreator. This ui files is ok, some ui files are clean and every ui file could be open in QtDesigner without any problem. Moreover, ui files that included in the pro-file could be opened easily. I can not open exactly ui-files that are included in pri-file that is respectively included in pro-file (sorry for this complex chain, but it is :) ).
Moreover, If I create a new ui-based class, ui-form opens and then QtCreator stucks anyway while Reading Project starts and appropriate message appears in the right bottom corner.