Assembler: Disassembling switches to assembling when you go a few KM away
If you set the assembler to disassemble lots of things enough that is going to take a long time and you fly a few km away and come back. The assember has switched to assemble mode but remembers the number you told it to dissasemble.
you set the assembler to disassemble 30,000 thruster components and fly off to a distant asteroid.
you come back and you find you now have 40,000 thrusters and the assemble is busy building another 20,000.