From Citizens Information -any form of welfare outside that group who chooses to travel will continue to be paid
If you are getting Jobseeker's Benefit, Jobseeker’s Benefit (Self-employed), or Jobseeker’s Allowance you can go on holiday on the island of Ireland for a maximum of 2 weeks and get the 2 weeks payment on your return. Since 7 July 2020, you will only be paid for a holiday abroad that is in accordance with the General COVID-19 Travel Advisory in operation. You will also not be paid for the 14 days that you are required to self-isolate when you return from abroad.