Dispaly problem in SDL simulator

Hello,when I set LV_COLOR_SCREEN_TRANSP to 1,There has a display problem in my simulator(like the pictur1).How do I solve this problem.The lvgl version is v8.3.0(Latest code).
There is no problem with v8.1.0.

@kisvegabor This might be a bug with the recent transformation update?

Yes, probably. I’ve pushed a fix to lv_drivers.

But there has the same problem in my Embedded device!