i am not that surprised by the lack of E
the E was
more in coastal dalmatia ( lets remember the zemunica cave e-L618 case)
here in this research most of the samples from deep mainland east croatia
p.s
it is pretty cool for r1a guys to see this
in the roman dated sample r1a appear
maybe a lost slav ( page 4 in the pdf )
POP23 Beli Manastir-Popovazemlja Roman Period 260–402 calCE Croatia_Pop_RomanP M 962,966 T2f2 R1a1a1b2a2b1
https://en.wikipedia.org/wiki/Beli_Manastir
Funnily its the other way around. In the earliest Neolithic peroid, E-L618 was in the coastal zone as well, with the Cardial-Impresso Ware Neolithics. But in later times, they moved up the North, along the Danube. We had Lengyel-Sopot samples form those more Northern areas in Hungary and they had 2 E1b1b samples. They seem to have moved on to the North, into the Carpathians, to spread either with Lengyel-Baden or Tripolye-Cucuteni, from which they entered the Epi-Corded horizon and later transformed, probably from Unetice -> Tumulus -> Urnfield (Gava).