Yes! Fixing that SDK issue would be a major contribution.
And since pull-request integration is getting attention this week, let me point out that reviewing a PR also counts as a contribution in my book.
The Engine currently has 10 open pull requests: https://github.com/jMonkeyEngine/jmonkeyengine/pulls?q=is%3Aopen+is%3Apr
Only a few active people are authorized to integrate pull requests. But if you can read this thread, it’s likely you can contribute by reviewing a PR.
I’m particularly concerned about PR 1049, which has been awaiting review since March. It addresses an important bug. It’s a bit complicated, but not outrageously so. Would someone who understands collision detection take a close look, please?