Alt-click (Windows) with selection tool works opposite to the way it used to

Starting with the first 13.1 update of Premiere Pro a week or two ago, and continuing through version 13.1.1 and 13.1.2, the behavior of the Selection tool has changed for me.  I am on Windows 10, and I am currently using the latest version as of this writing: Premiere Pro 13.1.2 (Build 9), as shown in the Help > About Premiere Pro... box.

Until a week or two ago, if I used the normal Selection tool to click on a normal linked clip in the timeline, it would select the linked video/audio track together.  If I wanted to select only the video track, or only the audio track, I would use Alt-click, rather than a regular click of the mouse.  It has worked that way for years.

However, starting a week or two ago, it now works exactly the opposite.  Now, if I click on a clip, it only selects the video or audio portion of the normal linked clip.  If I want to select the whole linked clip (video and audio together), I have to hold down the Alt key while I click.  This is exactly the opposite of the way it used to work.

This problem seemed to start when I updated to (I think) 13.1 a week or two ago.  There have been two updates since then (13.1.1 and 13.1.2), but this problem still persists.

Is it possible that I accidentally changed a Preferences setting?  Or is this a change in the behavior of Premiere Pro?  If this is a change in the behavior of Premiere Pro, I'm bummed - this new way it is working is quite inconvenient, and also contradicts hundreds of tips on the Internet that explain how the Premiere Pro selection tool works.  I have checked all the Preferences, and I don't see anything that pertains to this.

Has anyone else seen this problem?  I'm really hoping the fix for this is something simple.  I searched the forums, and I don't see anyone else who has seen this problem, so I'm thinking that it is only happening to me.

Any help appreciated!