Hi,

I have noticed strange issue when this mod is enabled - my steel chests (they are selected as merging chest type) are now stacking not in 50's but in some other bigger amount - more than 150. I do not have more steel chests yet so not sure what is stack limit now. After disabling mod steel chests begins to stack as usual - in 50 units.
This is happening only for steel chests.

Intended behaviour. In order to let bots place merged chests, the stack size of mergable chests has to be modified.

what is new stack size?

Depends on your mod settings. Stack size is modified to the maximum area a merged chest can have.