v1.18.9 has big changes st7789 display driver wise. It’s a Beta release in a way. And it states the following in the description.
If you’re looking for your code to keep ticking along as usual then please grab v1.18.7
The examples likely need a bit of editing to work with the new unifying driver. I’m using 1.18.8, but then, I’m partially responsible for 1.18.8 and 1.18.9.
I was after dual display support and a smaller frame buffer as i was using up the 264kb of RAM.