I play on PC and had most of my “large chests” on sandstone triangle foundation pieces - when the 500+ patch was released to the live PC version about half the large chests were despawned.
I had two furnaces places across triangle and square sandstone foundations - one was despawned, the other was unaffected by the patch.
All the cupboards and chests and workstations that were only on square sandstone foundations were unaffected by the 500+ patch.
Also note: the 500+ patch brought with it an unpleasant bug where players could spawn within their foundations AND a bug where destroying or building anything would cause thralls to fall through the buildings to lower foundation pieces or the ground (sometimes killing them). But usually the thralls were still present but “trapped” inside structures. In some cases the npc was partially exposed so with careful manipulation I could get their interaction menu open and pick them up to move them. In other cases the structure had to be destroyed before they could be interacted with…but only did this after the hot fix that fixed them falling through structures upon building (otherwise it just extended the problem to more thralls)
So based on my experience with the 500+ patch and triangle foundation pieces, I would say you are right to be concerned.
However, you now have notice that there will probably be issues and can take action to create multiple storage areas that are less likely to be affected and distribute your resources so you do not lose your entire supply of an item if one chest despawned.