A bag of holding has a special caveat:
Placing a bag of holding inside an extradimensional space created by a Handy Haversack, Portable Hole, or similar item instantly destroys both items and opens a gate to the Astral Plane.
Now, the 2nd level spell Rope Trick says:
(...) At the upper end of the rope, an invisible entrance opens to an extradimensional space that lasts until the spell ends.
The extradimensional space can be reached by climbing to the top of the rope. (...)
Is it safe to bring a bag of holding inside the rope trick extradimensional space?