We have another J2b2a L283 from a Bronze Age site Mokrin in North Serbia. It is dated at 2000-1800 bc ( Maros culture ) . It was found alongside of three R1b-Z2103 -s and I2a-s. It has some 40 percent of Steppe ancestry like others from the same site.
The other J2b L283 was found in Croatia MLBA. Also with a lot off Steppe ancestry. Other younger cases were found in Italy some in Sardinia without Steppe. Those are published in different papers.
So why this is an important finding? The reason is that the L283 do not give impression to be a classic Neolithic or even post Neolithic lineage that moved from Anatolia to Europe were it is prevalent today. In the current stage of our knowledge it looks like it was a South Caucasian lineage that crossed the Caucasus and moved to Balkanes via Steppe in Bronze Age. Indeed the two other cases of L283 are found in ancient Armenia and in MBA Kabardino Balkaria (North Caucasus).
Here the modern data were You can see an Armenian on the root of branch.
Here the pre print.