No GUI Implemented on overlay in inspector

What happened?

In some inspector windows, a "No GUI Implemented" message appears above the other elements, and some elements are stacked together (see screenshot).

How can we reproduce it?

It happened while using an external library which developed a "InformationAttribute" but the PropertyDrawer class file was named InformationDrawer.cs instead of InformationAttributeDrawer.cs.

If screenshots would help explain or demonstrate your issue, please include these.

In the screenshot, you can see it on a LayerMask property, then on an int field. Both of these fields have an Information attribute defined above them.

What version of Unity are you using?

2018.2.11f1

What version of Odin are you using? (See "Tools > Odin Inspector > About")

2.0.5

Do you have Editor Only mode enabled?

No

What operating system are you on?

Windows 10

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