Attachables are not affected by lighting features inside of render controllers

While making a feature for a resource pack, I’ve noticed that Attachables cannot use lighting features inside of a render controller. I’m confused as to how certain Attachables specific bugs like this happen, as their client files are handled similarly to client entity files with the format version 1.10 and higher.

Steps to reproduce

1. Download the example pack that’s in this bug report. This should do the following to the shield: Its face lighting should be very dark and it should ignore world lighting. Sorry if there is some json parsing issues, this was made very quickly.

2. Hold a shield with the provided pack enabled.

Expected Behaviour:

The shield should have the mentioned changes.

Actual Behaviour:

The shield remains the same as vanilla.