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TIMATIC states :
Notice Bulgaria - Destination Visa
Visa required. Visa Exemptions
Passengers with a "D" visa issued by Cyprus, Romania or a Schengen Member State for a maximum stay of 90 days.
The maximum stay is granted within 180 days.
Passengers with a residence permit issued by Netherlands for a maximum stay of 90 days.
The maximum stay is granted within 180 days.
You can visit Bulgaria visa-free for 90 days/180 days based on your Residence Permit from the Netherlands