Yes, this happens to all my characters, for the last couple of days.
I log in.
There is no furniture etc in the Housing Editor (except for account-wide pets, mounts, services etc and anything that is in the character's personal inventory).
I open a storage chest and remove one (or more, but it only needs one) item from it to my inventory. I close the chest. The entire contents of that chest are now displayed in the Housing Editor. Same goes for the other chests, which all have only furnishing type items in them as I don't store anything else..
I log out.
Next time I log in, the contents of the chest(s) are no longer available in the Housing Editor (with the exception of account-wide pets, mounts, services etc and anything that is in my character's personal inventory....plus the item(s) I removed from the chest(s) last time I was logged in).
Well, I like very much having the furnishing items in my storage chests available for instant decorative use in the Housing Editor without having to remove them first, as I'm sure every home decorator here will agree. And I assume that suddenly not having access to chest contents via the Housing Editor (until the above manoeuvre is performed at each login) is a bug.
If so I'd be really grateful if ZOS fixed it.
I hope this explanation is clearer than my OP.