[2.0.57] Containers give phantom signals after migrating inventory_type to `with_custom_stack_size`

[cyx2020f]

Reproduce:

1. Build a normal steel chest and fill it with coal, the tooltip gives 2400 (50 * 48) and connecting to a signal network will also give 2400. Now save the game.
2. Enable the tall chest mod by boskid https://mods.factorio.com/mod/tall-chests, the default threshold is 20.
3. Load the same save file, the tooltip still gives 2400, no coal are lost, but connecting it to a circuit network gives 3800 (50 * 28 + 2400), 1400 are extra.

It seems that the deleted inventory slots still think that they have a full stack of coal.

RecApp-2025-06-21.mp4

(26.25 MiB) Downloaded 24 times

[boskid]

Thanks for the report. Issue is now fixed for 2.0.58.

For this issue to happen, an inventory type of a container needs to be changed and size of the inventory must be reduced. This issue is not specific to inventory with_custom_stack_size, this mod happened to just match both of the required conditions.