unfortunately,that is typically what happens with the newer hboots. 1.54+ seem to have the ability to boot a recovery image removed
the command youre running is to temporarily launch the recovery into usable memory,so you can use it to install superuser and your kernel,without permantly installing it on the phone. this is why you cannot boot to it after the fact by selecting recovery from the hboot menu.
what you will need to do is permantly install the recovery,and then install the kernel,and superuser. afterward,you can reinstall the stock recovery via the same method youll use to install twrp( fastboot flash recovery imagename.img
if youve taken the most recent update,we may need to find an OTApkg to take a stock recovery from,otherwise there is a thread on xda with the decrypted ruu that you can use the recovery image from.
im on my way to work,but i can certainly help you find the stock image later today/this evening if needed