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Thank you very much for the comments!
I am aware about the strange borders in Brezovica. It seems that is is no real true Croatian exclave because the small area appears to be connected to the motherland by a very thin corridor, most likely a (former) road. Still this corridor partly follows a road, but the northwestern part penetrates a building. Therefore it is a (2.4 Class) pene-enclave/exclave.
I chose to believe the Arkod.hr map is inaccurate drawn.
After the exclave area of Baarle I think Brezovica is the most special border area in Europe.