Environment CRC mismatch

The CRC generated by mkenvimage is not valid when written to the storage device where uboot wants it. I get a "Loading Environment from MMC... *** Warning - bad CRC, using default environment" when I insert a SD card with U-boot and the environment I built.

The environment is stored at the correct place on the SD card, I boot U-boot and get the error, perform a "saveenv" and then read back the saved environment from the SD card on my PC. They look the same (uboot adds a serial number and MAC addresses when the default is saved).

So the question then is, Do mkenvimage and the uboot build process use different crc algorithms?

U-boot version 2020.04