So glad it's not just me. Since I updated the game this morning, I've noticed that issue as well. Blank squers where there should be Pokémon. Also I have a pichu with ash's had but it's shows a regular pichu until you go into it you power up. While I'm on the subject of issues I've started to get lots of network errors when playing, from just walking to gym battles. They all have codes now but I can't find what the codes mean. I could not take over a gym earlier because of network error 2, 29 and 30. GPS loss now has a code of 11.
I even reinstalled the game to see if that helped but nope.
On the plus side the last ball glitch is fixed. Did 9 entei raids today and caught it on what was going to be my last one on the last ball.