ZRAM stores data in RAM to reduce writes (and wear) on your SD card. If you pull the plug while the Raspberry Pi is running, then that data won’t be saved to the SD since you didn’t execute a controlled shutdown. Cutting power to an RPi can also damage your SD card. If you’ve been doing that a lot, then you may have trouble with your system sooner than later.
I see that this was discussed in another thread that you started. The answer remains the same: protect your system with a UPS.