I remember at these post for release 1.13.16.0 where the other vsync bug was fixed.
It might be some users already reported issue, but we not aware of it.
You can do some tests with the Nvidia Controll V-Sync Setting, but I’am not sure whether this will helps a lot ( persistent ) and possible you have to limit the fps then also outside of MSFS.
yep… it is not necessarly a multi-monitor issue. Of course , we know that Ext.Window-Mode is only necessary in case you want to move it to another monitor. But the issue also exist, as you said , in single monitor mode ( as by me ). Simple answer the support and explain him again what you have done. Possible made screenshots , link to forum posts, etc.
If I have bit time, I will also create a new ticket and I can refer to my older one. The “effect” is the exact same “second v-sync-step” (in my case) as in the fixed former issue. For me is it of course not high prio, because I don’t use the ext.windows often.. but might be important for other users.