Absconding from NP — consequences?

Fresher, 6 months FTE + 6 months intern. 90-day NP. Have a previous 3 month internship at a startup.

Got an offer with 90% hike, need to join Jan first week. Resigned a month ago — would need to leave ~50 days early.

New company is ready for buyout or slightly delayed joining. Current company won't engage — manager postpones, HR useless. Month of trying, no decision.

New company suggesting I abscond. They'll BGV from my previous role.

Questions:

• Long-term problems with "absconded" tag?
• If I offer buyout, can they still withhold relieving?
• Real F&F impact?
• Did it hurt future switches?