Despite regular updates and bug fixes, the harsh reality is that League of Legends is plagued with bugs. Following Patch 13.5, the game now has a game-breaking bug that allows high-Elo players to get into low-tier games.
On March 13, a player reported in a post on League’s subreddit that a Diamond player was constantly featured in their Silver solo queue games. This, expectedly, got many players worried, but one heroic player explained this started with Patch 13.5 and pointed to their detailed explanation in the bug report thread for the patch.