This is from the recent v3.3.6 patch notes:
Deleting the last character to load into your home will no longer cause bound items to be lost from your home storage.
It'd be nice to know if someone tested it though
I haven't had any issues with them but I've not deleted any characters which is where I understood the problem to be.
pandoraderomanus wrote: »I filled my boxes with 120 monster set parts and deleted 2 characters - nothing disappeared. Fixed.