Spotify not working on Qt6 WebEngine with codecs and drm support

[Queequeg]

Hi.
I compiled Qt 6.4.1 WebEngine with proprietary codecs on Windows 10 21H2, DRM works too (html5test and bitmovin player show that DRM works through widevine).
YouTube works, audio and video works properly, but not Spotify.

In application output i have several warnings and one error

Warning: Unable to open or create cache entry

Error: In memory database cannot use the given database directory

Warning: SampleGroupDescription box with grouping_type '1919904876' is not supported.
Warning: SampleToGroup box with grouping_type '1919904876' is not supported.

Any advise?