[Solved] [1.12.2] Supporting Waila, but text doesn't show up in the tooltip

[Aarilight]

I know this isn't quite an forge thing, but a question about an api. I did see a couple other posts about this on this forum, tho, and Waila has become a universal thing, kinda, so I figured this would be okay...

I'm having trouble getting my Waila support to work. I've registered the support and made it set a header and a body for my "Summoner" block, but neither appears. I tried adding some logging to see if the code was even being hit, and both of my providers do log when showing the tooltip for that block, but for some reason they still don't show up in the tooltip.

Here is my WailaPlugin:
https://github.com/Yuudaari/souls/blob/4a6985476a44451bfed9bb407cc7124ca2cba72a/src/main/java/yuudaari/souls/common/compat/Waila.java

Here are the lines that actually generate the tooltip:
https://github.com/Yuudaari/souls/blob/4a6985476a44451bfed9bb407cc7124ca2cba72a/src/main/java/yuudaari/souls/common/block/Summoner/SummonerTileEntity.java#L542-L557

What am I doing wrong?

[Edit: Solved]
You can't create a new List<String>, you must add your lines to the provided one.

Edited December 16, 2017 by Aarilight