In 2014, Valve transferred its games to the SteamPipe content distribution system, which caused an annoying bug: characters in Half-Life stopped blinking. It took the company five years to fix the flaw, and finally the City 17 residents blinked again.
The bug was quite selective: the characters in the cut scenes continued to blink, but the NPCs roaming the city lost this privilege. The problem was discovered in Half-Life 2, Episode 1 and 2, the techno demo Lost Coast and a remake of Half-Life: Source.
In fact, the bug was fixed by fan patches much earlier, but now the official patch from Valve itself has been released.
Half-Life 2 was released in 2004, then the game received two additions. For about ten years now, there has been talk of creating Half-Life 3, but one of Valve’s employees said that they never really started working on the game.