Pulsing Highlight Around Insertion Point in Messages

spycoops wrote:

Since upgrading into Tahoe, (and probably after experimenting with some accessibility settings!) — I have developed a pulsing highlight around the insertion point in Messages. It doesn't happen anywhere else where I input text except WhatsApp and other messaging apps.

The annoying thing is that if I leave it for a while the flashing highlight gets larger and larger and more opaque and I can't see the text beneath to see what I'm inputting.

Anybody know what this is and how to get rid of it?

Is that the same as referenced here—

Disabling glowing throbbing cursor in mac… - Apple Community