Hi,
To export it, you can use the 3ds Max 'quad menu' (right-click with the ForestIvy object selected) and choose transform > Convert To: Convert to Editable Mesh. This will convert it into a Mesh-type object. To use this method, make sure that Display > Viewport > Mesh mode is selected.
Are you experiencing this material issue with all presets? Some of the bundled presets, such as Common Lantana, use two-sided materials, and it’s possible that the two-sided material isn’t being transferred correctly. Please feel free to wire the 'Leaf - 1 Sided' material directly to the Multi/Sub-Object material to see if that resolves the issue.
I hope this helps.
Best regards,