I can replicate that behaviour too with streaming set to HiFi.
I would confirm with @danny and others though, because those MQA files are still in FLAC wrappers. Effectively you can put anything into a FLAC wrapper - a low bit rate mp3 - for example. The source file will still have undergone its MQA conversion, it’s just you’re playing what is basically a 15-bit lossy conversion in a FLAC wrapper.
So I don’t think you’re getting a Redbook stream by doing this, but would be happy to be corrected.