Safari 15 opens all my bookmarks
Something has been haywire with Safari for quite some time now on my Mac. In Safari 14, if I opened a new window (with either command+n or file > new window), it would load all of my bookmarks in the new window. I recently upgraded to Safari 15, and the problem has progressively gotten worse. Now, when I relaunch Safari (either from quitting & relaunching, or restarting the Mac) it will load all of my bookmarks instead of the last saved state.
Since essentially the same behavior has carried over between two versions, it doesn't seem like it's a a browser bug. I did a "clear history..." from the menu, and that had no effect. What the heck is going on with this?
Safari 15 | macOS Big Sur 11.6 | MacBook Pro 15" 2018
MacBook Pro 15″, macOS 11.6