Right-click weirdness in Zen on Fedora/Gnome

Just within the last week or so I've been experiencing a strange issue with Zen on Fedora Workstation. When I right-click to open the context menu (which I do constantly to access the back button since I use compact mode in Zen), the context menu will open but immediately close rather than remaining open as it should.

A Google search suggests that this can be an issue in Gnome, which apparently has an alternate right-click functionality where rather than right-clicking to open the context menu and then left-clicking the option, you can instead hold down right-click, move the cursor to the option, and release to select it. I've been using Gnome for over a decade and was completely unaware of this functionality, but regardless I'm not sure that's related to my current issue since I've only experienced it while using Zen.

It also seems to be at least somewhat depending on the location of the cursor when I right-click. On Reddit, for example, if the cursor is over an image or just a post in my stream, the context menu is more likely to instantly close than if the cursor is over an empty section of the page (such as between the stream and the right content area).

Also, I'm not sure it's related, but while experimenting I found that holding right-click in Zen can produce some even weirder behavior. Sometimes the sidebar will open and act like I'm hovering the cursor over it despite the cursor being on the opposite side of the screen, even allowing me to interact with the sidebar with left-click while continuing to hold down right-click. But it's too finicky to be useful since moving the cursor often results in the sidebar subsequently closing, and potentially for some unintended sidebar or contect menu option to be selected when I release right-click.

Any suggestions as to a fix, or should I file a bug report?