On A/B devices, no ramdisk is required for normal boot because system.img is mounted as rootfs when processing Device Tree ( dtb) which is appended to kernel image usually. Traditionally boot.img and recovery.img had two major components kernel and ramdisk. Use magiskboot to allow repacking boot images for installing TWRP
Now the official TWRP release includes the option Install Recovery Ramdisk: On TWRP this has been previously achieved by flashing a special ZIP file, or one could do manually. Then repack and flash boot.imgs back to device. But to permanently flash recovery to device which can be booted into by proper key combination, you need to unpack both of your boot.imgs (A/B) from device and replace the ramdisk with the one extracted from twrp.img. You can only boot in recovery mode with fastboot boot twrp.img. Devices with A/B partition scheme don't have a recovery partition.
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