Been noticing a lot of AFK bots and AFK timer exploits in Co-Op v. AI games

Recently I've been matched up with a few summoners with generally bot-like usernames (i.e. asdads1235) in Co-op vs. AI games. They usually don't say anything throughout the game. When they do, it's in champion select or post-game results and say messages that could easily come from a script. In game, it looks like they're actual players. They go to lane and farm for a bit. However, it seems that once they get enough gold to buy Bami's Cinder, they go back to base, usually immediately, to buy it. Afterwards, they head straight to a jungle camp and simply sit there until the game ends. Due to Bami's Cinder's passive, it looks like the AFK timer simply won't apply while they're near a monster they can't kill. Most of the time, I see Teemo or any other champion with an invisibility ability. It clearly looks like scripted bots to me, but I'd prefer if Riot took a look at this.