problem with updateDisplay()

more than a year i reported (on other forum)
about a bug that arose in version 4.0
with updateDisplay function, on a gui-less VST plugin.

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if i (the programmer not the user) make a change to some parameter
by programming
and then call updateDisplay,

RESULT -> reaper doesn't call plugin - getParameter, as it should.
the sliders remain the same

EXPECTED -> reaper should call plugin - getParameter
and update the sliders
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I checked this with reaper version 3.0, it works fine.

now i can't use reaper anymore,
i'm using other daw, that works correct.

i'ts very important to solve this bug
since it breaks all gui-less plugins.

hope you solve this soon.