As the title says.
When I attempt to place improvement materials in housing storage containers, recently collected items form a new stack, even when the existing stack is way unde r the 200 max (eg: a stack of 4 tempering alloys will not stack with a stack of 7 tempering alloys already in storage).
When I retrieve both stacks to my inventory and attempt a manual stack with 'Y', the two stacks remain.
Did you change the item IDs for improvement materials in a recent update? If so, was this deliberate? And if it was deliberate....why?