Silent failure of build when creating a new RR Type if CODE is out of range

Summary

If you are attempting to add a new RR_TYPE and select a number greater than 65535 (which you shouldn't and in my case was a typo of 65635) then it appears to build but silently ignores the new type

BIND version used

BIND 9.15.7 (Development Release) id:993633ad96 running on Linux x86_64 4.15.0-72-generic #81 (closed)-Ubuntu SMP Tue Nov 26 12:20:02 UTC 2019 built by make with defaults

Steps to reproduce

Add a new RR type with an invalid number

What is the current bug behavior?

Code appears to successfully build but does not include the new type

What is the expected correct behavior?

Should issue an error that the code is out of range