Cursor disappearing in the text editor

I was just making a post in one of my communities when my cursor suddenly dissapeared. I thought the text box had frozen or something, or maybe gone to preview by mistake. I tried clicking back and forth to and from preview but that didn't help. I thought I'd have to resign myself to copying the text from the preview, reloading the page, and reentering the other fields, but then it turned out I could in fact still use the editor. My cursor was just gone. This continued for the rest of my time writing the post. (I'm now making this unrelated post in this community and my cursor is fine.)

I'm on the website on a Mac laptop.