`@grant GM.addValueChangeListener` is not recognized

[Sv443]

What happened?

I tried uploading an updated version of my userscript which now has the @grant GM.addValueChangeListener, used throughout the code via GM.addValueChangeListener(), but the website errored with code 400 and wouldn't let me upload it until I changed the metadata grant line to GM_addValueChangeListener.
The metadata block now looks like this:

// @grant             GM.getValue
// @grant             GM.setValue
// @grant             GM.deleteValue
// @grant             GM.listValues
// @grant             GM_addValueChangeListener
// @grant             GM.getResourceUrl
// @grant             GM.setClipboard
// @grant             GM.xmlHttpRequest
// @grant             GM.openInTab
// @grant             GM.registerMenuCommand
// @grant             unsafeWindow

What did you expect to happen?

Since this doesn't happen with any of the other grants I have set, I expect the behavior to be consistent.

What the problem might be?

When validating userscript metadata.

[Martii]

Thanks for letting us know. Should be deployed along with GM.removeValueChangeListener.