It's just louder. The 2nd path adds up to 6dB of signal. Reverb mix is 5.8%, so it's a 100% dry signal mixed with a 94.2% dry signal, making it even louder.
At certain volumes - like bedroom volume or with headphones - volume increases like that aren't as obvious and things just sound "more" and "better."
Does the Mix parameter "see" and mix in dry signal? Otherwise, how does putting it after the Amp and manipulating it turn out the same result as the parallel option in OP, given it "sees" the dry signal in parallel?
It's just louder. You are falling victim to the classic Fletcher-Munson effect where "louder sounds better". Putting the reverb in parallel like that just adds volume. It has NO effect on the actual tone.