Steps to reproduce:

According to the help (see here), LLD Macros can be used in item prototypes for update intervals. Now item prototypes don't have a field called "update intervals". They do have a field called "update interval" and one (or many) in the "custom intervals" section (which effectively expand an "update interval" in to many "update intervals". I have a need to schedule specific update intervals based on a LLD discovery of specific clients. As sample JSON discovery string for this is:

{"{#CLIENT}":"TEE","{#START}":"8","{#END}":"23","{#FREQUENCY}":"2"}

However when I try to enter

h{#START}-{#END}/{#FREQUENCY}

I get the error "Incorrect value for field "delay": invalid delay."

Expected:
In order to be able to support "update intervals" as stated in the help (and to enable me to support our system ), LLD macros need to be accepted in the multiple "Interval" boxes of the "Custom intervals" section.