There is a known issue in Reaper where VST3 GUIs may not appear. This occurs not only with the RackAFX projects, but with the Steinberg VST3 sample projects as well.
This issue has been fixed starting with Reaper 5.24Pre1. As of this writing, Reaper is still at v5.23
You can find the pre-release of v5.24 here:
When 5.24 is released, I will edit this topic to update it.
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