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202e6c17 - Update dynamic env handling to preserve None when USE_DYNAMIC is unset (#3567)

Update dynamic env handling to preserve None when USE_DYNAMIC is unset (#3567) * Update dynamic env handling to preserve None when USE_DYNAMIC is unset * Apply suggestions from code review --------- Co-authored-by: Ilyas Moutawwakil <57442720+IlyasMoutawwakil@users.noreply.github.com>