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This depends on the design. To dump contents of the flash chip it must be powered, and the driving device (driving outputs) on the PCB must be in high impedance (Hi-Z) state. If you have flash connected to the processor directly and you are sure, in reset condition, having consulted its datasheet, that it will pull all flash-connected/related signals to Hi-Z,...


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You're assuming your 5V supply goes immediately to zero when disconnected. In reality, it will fall slowly as LEDs have some capacitance, and they stop conducting substantially once the voltage across them is below their rated forward voltage. In addition, you have current from both the 10K and internal pullups which largely has to go through your 1K ...


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