yes sadly and with no logical reason the 6 month visa requires extensions and border bounces. I mean logically a 6 month visa should at the absolute most require a 90 day report like the non-o visas but yeah for some really fugged up reason this is not the case
As with the other posts. Depending on how many 30 day entries you have could determine your fait in getting back in. I returned on a 60 day tourist visa this time and was questioned