I've been planning for years to remove an internal wall between kitchen/dining in our 1963 house.
SWMBO keeps reminding me to get on with it.
I've had two LBP builders look at it, it runs parallel to floor/ceiling joists, there's no roof support above it, there's no pile/post under it. In about a minute each, both builders poked their heads up in the roof space and have said "no worries mate - it's non-structural".
But it does have a double joist below and above, spaced 2" apart. Now I assume that those were put in solely for the reason that the floor and ceiling plate 4x2s sit in the middle, so the edge faces of the joists overhang the plate an inch each side - the sole function of the double joists is so that there's something that flooring timbers and and ceiling lining could be attached to. If that's the case, then yes - there should be "no worries" - but I do tend to worry anyway.