Hmm, did you make the 240p vs FLAC strawman deliberately? Or is the bug (as you're able to reproduce it) really that bad? I know OP was using high-end headphones but I expected at least a slight hissle.
(My attempts to reproduce were with a PX80, S2PGFY-003, JBL Pulse and Bose Companion 50. I included the speakers because I couldn't get the headphones to do the trick)