Does anyone have a fix for Camino's problem with forgetting the mini web site icons that appear next to the URL in a bookmark list?

I imported my bookmarks from Safari, if that makes any difference. I didn't expect the mini icons to come along, but if would have been nice.

Anyway, at first I thought they would repopulate as I visited sites anew. But they only last a while and then one or two restarts later and they are gone, and the generic icon takes it place. But some seem to stick around longer than others.

I tried deleting the old and replacing with newly saved bookmarks, but they still get forgotton.