The mod Merging Chests (6.1.0) caused a non-recoverable error.
Please report this error to the mod author.
Error while running event WideChests::on_player_selected_area (ID 52)
WideChests/control_init.lua:30: Arguments count error for 'get_inventory_size': Expected 1 argument but 2 were given
stack traceback:
[C]: in function 'get_inventory_size'
WideChests/control_init.lua:30: in function 'can_move_inventories'
WideChests/scripts/event_handlers/merge_chest.lua:195: in function <WideChests/scripts/event_handlers/merge_chest.lua:187>
I have Stack Size mod (https://mods.factorio.com/mod/Silicon) set to 500, it was working until 6.1.0,
happens with steel chests even when empty.
Also bots have no problem placing/deconstructing merged chests.
Love your mod cheers!