Basecamp - missing tracks from a Forerunner 305

I connected my wife's old 305 to BC today for the first time. (I have been using a Montana for our kayak trips, but she fires up the Forerunner, too.) BC shows many waypoints, but only 4 tracks.

The 305 itself shows many more tracks than come up on BC. Plus, the tracks on the 305 show up on Garmin Connect.

I found an old question on this forum dating back a few years, where someone had the same issue, but there we no replies.

Has anyone been able to figure this out?

Thank you