Over the past few weeks I've noticed that when I switch tools sometimes the characteristics of the previous tool continue rather than it switching to the new tool (but it shows the new tool selected in the Toolbar.

So, for example, if I'm using the Selection Tool and then click on the Direct Selection Tool it shows in the Toolbar that I have the Direct Selection Tool activated and the cursor is the Direct Selection Tool one but the tool behaves like the Selection Tool (i.e. I can't select individual points).

Saving the file seems to fix the issue and the selected tool then behaves normally. Changing the tool from one to another doesn’t have any effect, only saving the file seems to fix the issue (temporarily).

I have observed it most with the Selection Tool and the Direct Selection Tool (my most used tools) but I have also certainly experienced it when switching from the Rectangle Tool and Type Tool to the Direct Selection Tool (and probably other tools that I don’t remember off the top of my head.

It has happened over multiple files over a number of weeks so doesn't seem to be an issue with a particular file.

Another issue that may be related is from time to time when I go to drag the Proxy Preview Area in the Navigator pane I find that the magnifying glass has activated itself and it zooms in in the Navigator pane.

Again, saving the file fixes the issue.

I've tried uninstalling and reinstalling Illustrator, restarting my computer and upgrading Big Sur from 11.4 to 11.5.1 but the issue persists.

I’m running Illustrator 25.4.1 on Mac OS Big Sur 11.5.1.