Anisotropic filtering settings have been limited on Mobile for better performance, but it seems that anisotropic filtering is no longer forced on which has made many worlds suddenly look worse. This setting hasn't been changed on PC which may also confuse world creators. I've attached an image comparing Saguraki C.D. and Happy Hill Dog Park in live and beta, but I've also noticed this in Eventide, The Shore, and Kugo Hot Springs and almost every other world I've visited in the beta.
I'd suggest reverting mobile to force filtering on, changing PC to per-texture filtering, or notifying creators somewhere that the setting is no longer consistent for mobile.