I am asking because the spaces don't collapse for me with LuaMetaTeX 2.11.08 
(level 20250917):

    (global macro:{h␣␣ello} )
    (global macro:world␣)
    [h␣␣ello␣␣world␣]

For

{h  ello}
world

I am assuming that's part of the unreleased fix, i.e. your "patched version of 
\read" then?

Best,
Vit
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