VSTest Agent - property 'ForcedLegacyMode' in .runsettings file caused TestRunParameters nulls - how to fix this ?

I woluld like to add recording my tests in VSTest Runner.

I have one .testsettings file with enabled test recording and multiple .runsettings files with various custom params.

My example .runsettings:
..\TestSettings1.testsettings true

From there http://ift.tt/1Wjm6tB

I know that when i specify path to .testsettings into .runsettings file I have to add ForcedLegacyMode 'true' too.

But when this is set, values in TestRunParameters are nulls when I read them in ClassInitialize.

Any help ?