Well, it was just that I hadn’t included the RVT in the “Draw in Virtual Textures” array, 
but now it’s the same as before and even more blurry.
Because before, only the painted material in the landscape was blurry, but the texture was visible at a good resolution, now the texture resolution has worsened. The first image is how it looks now, and the second image is how it looked before:
Thank you and greetings!