Describe the bug
Scimming through the code, I think I have found a typo in BuffTrigger2.lua:730. It seems like it's supposed to be: unit == "nameplate".

I would suggest you check that this is actually necessary, though, since I didn't find that bug through wrong behavior. I have no idea what that line actually does/when it is called so I cannot test if the line actually causes undesired behavior.

Do you have an error log of what happened?
No. Just check the code.

To Reproduce
Check the code at BuffTrigger2.lua:730.

Did you try having WeakAuras as the only enabled addon and everything else (especially something like ElvUI) disabled?
As stated above, I have not been able to reproduce the bug or even verify that it is in fact a bug, but the line has definitionally undesired behavior.

Which version of WeakAuras are you using?
I check the master branch

Was it working in a previous version? If yes, which was the last good one?

Great find, thank you!