# Can a Thorne-Żytkow object be the progenitor of a modern quasi-star?

I was reading some Wikipedia articles about astronomy, and came across an interesting line:

The neutron star may also accrete sufficient material to collapse into a black hole.

Now, here is my theory:

If a massive supergiant star ($$>20 M_\odot$$) has a neutron star at its core, eventually the neutron star will pass the TOV limit, collapsing into a black hole. So if the new black hole is still in the star's core, and the outer envelope is not ejected, will a modern quasi-star be formed? If so, how long would it live for?