You might even be able to get yourtp_databack, assuming it didn’t get zeroed or overwritten.
Dump yourubipartition and then run this Python script (or something equivalent):
import sys
import pathlib
ubi = pathlib.Path(sys.argv[1].strip())
with ubi.open('rb') as fin, ubi.with_suffix(".out").open('wb') as fout:
fin.seek(0x06F00000 - 0x00200000)
fout.write(fin.read(0x400000))
Then verify if the .outfile has a MT7986_EEPROM.binfile and a default-macfile.