Observing u/m photo of STANKO STAIKOV has some differences of my "Unknown Bulcon ship", and her name at poop seems being only one name.
Olá Stumps / Yvon
Thanks for your comments
My son who shot the photo remembered now the name of the ship was PIONER, sister ship of the NESSEBAR.
The under mentioned link shows the PIONER
I think that it is PIONER (IMO 8903727)
particularly the unusual black extensions to the two aft light kingposts (or whatever they are), later removed.