Audio glitches, dropouts, timing errors and missing audio playback in nested sequences where audio clips in original root sequence contain audio effects, fades or crossfades. This appears to have been introduced with 12.1.2 release. Rendering audio makes little or no difference. The only workaround I've found is to export the audio files with the effects and fades, from the root sequence and re-import back into another track in the root sequence, thus eliminating the effects. This is not a satisfactory way of working. Please Adobe, give us reliable audio performance. I spend more of my time trying to figure out workarounds than I do using this product.