This bug report is a continuation of this [forum post|https://www.spigotmc.org/threads/loadbefore-tag-not-being-recognized-in-pluin-yml.543369/|https://www.spigotmc.org/threads/loadbefore-tag-not-being-recognized-in-pluin-yml.543369/].], but I'll try to include all of the important information from there here.

I have two plugins called TestMainPlugin and TestSubPlugin. TestSubPlugin states TestMainPlugin as a loadbefore in it's plugin.yml, like so:

[Code] (YAML):
name: TestSubPlugin
version: 1.0.0
author: willkroboth
main: me.willkroboth.TestSubPlugin.TestSubPlugin
api-version: 1.18
loadbefore:

• TestMainPlugin

[\Code]

Here's MainPlugin's plugin.yml aswell:

[Code] (YAML):
name: TestMainPlugin
version: 1.0.0
author: willkroboth
main: me.willkroboth.TestMainPlugin.TestMainPlugin

api-version: 1.18

[\Code]

However, when I run a server with both plugins I get this warning in the terminal:
[Server thread/WARN]: [TestSubPlugin] Loaded class me.willkroboth.TestMainPlugin.TestMainPlugin from TestMainPlugin v1.0.0 which is not a depend, softdepend or loadbefore of this plugin.

I've noticed that TestSubPlugin is still loading before TestMainPlugin, it just doesn't recognize that when trying to load the class.
 
Summary:
Even though I put loadbefore: TestMainPlugin in TestSubPlugin's plugin.yml, a warning saying that TestMainPlugin is not a loadbefore of TestSubPlugin appears when loading a class from TestMainPlugin's jar file
 
You can find the two jar files for my test plugins attached below, and my Intellij project files here.