App rejected because "Non-public API usage _CMTimebaseCreateWithMasterClock"

Hi, our app build suddenly got rejected:

TMS-90338: Non-public API usage - The app references non-public symbols in Frameworks/BitmovinPlayer.framework/BitmovinPlayer: _CMTimebaseCreateWithMasterClock. If method names in your source code match the private Apple APIs listed above, altering your method names will help prevent this app from being flagged in future submissions. In addition, note that one or more of the above APIs may be located in a static library that was included with your app. If so, they must be removed.

Developers of BitmovinPlayer confirmed that they don't use _CMTimebaseCreateWithMasterClock directly. They use public method CMTimebaseCreateWithMasterClock.

What new requirements from Apple side appears yesterday? Before our application was never rejected by this reason.