I have talked to my lawyer several times regarding this issue. I was told that this is the "black hole" of Immigration Law. Indeed, cases may be true that someone came back with AP and maintained a valid H1 without using EAD or applying for another vise overseas, but the situation is always uncertain. Perhaps that is why the discussion on AP/EAD/H1 is always so vivid.
However, my layer said during his conference with other layers, it seems there is no debate (among the lawyers)only if a person used AP and swith from H1 to EAD, or Applied another H1 visa overseas and use that new H1 visa, which is 100% safe for the person who traveled abroad and came back under AP.
However, my layer said during his conference with other layers, it seems there is no debate (among the lawyers)only if a person used AP and swith from H1 to EAD, or Applied another H1 visa overseas and use that new H1 visa, which is 100% safe for the person who traveled abroad and came back under AP.