Supportdir deleted after Basic MSI copying files during silent install

Hi,

I have an issue with Supportdir being deleted during Basic MSI silent install right after all files are copied. What happening is once all features/component's files are copied, Supportdir with all files are gone (deleted), though I has plenty of actions to perform. I have even tried to debug during silent install, but result is the same. But, if I do it in normal UI mode Supportdir stays until the rest of installation.

Has anyone seen the same issue?

Here is command I run: setup.exe /s /v"/qn" and for debug I run setup.exe /s /d /v"/qn"

Thanks in advance.