Help button in custom nodes is hidden when Nodes 2.0 = enabled

[jovan2009]

With Nodes 2.0 = disabled:

With Nodes 2.0 = enabled:

If you click on the help button while Nodes 2.0 = disabled ...

... the help panel remains visible if you switch to Nodes 2.0 = enabled ...

... but you can't close it (unless a close button is also provided in the panel).

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