I usually leave my PC on, just switch my TV off, and the next time I use it, I just need to switch my TV back on and can continue where I left.
Switching my TV back on shows first the desktop for 3-4 seconds, then the screen gets black again and it switches back on, I guess that's due to the screen resolution, it just adjust then again to 4K.
For around 1 week now, basically it's still the same when I turn the TV on but my Windows Explorer(s) just close, which is quite annoying as I have usually several open aligned next to each other. I does that all the time now.