Trademark Dispute: employer claiming my side project IP

I publish illustrative scenarios prepared by my practice. All participants and conversations are fictional. The fictional posts are not posts by real users, accounts of client experiences, or reports of actual results.
Illustrative scenario prepared by my practice.
For informational purposes only. This is not legal advice. Laws vary by jurisdiction. Consult a qualified attorney for advice specific to your situation.
Hypothetical question

Quick background on my situation — any input appreciated.

employer claiming my side project IP. I've been dealing with this for about 9 months now and the situation isn't improving.

This involves content I created over the past 28 months. I do have documentation proving my ownership and timeline.

What's the typical outcome in situations like this?