“Since Linux 6.9 (May 2024), the tool that locks the laptop’s drive on suspend had been silently failing.”
Full-disk encryption is supposed to protect a stolen laptop. For over two years it hasn’t, if the machine was suspended instead of shut down. The key sat in RAM the whole time while the resume prompt asked for your passphrase, so you felt protected and weren’t. A refactor broke a security boundary and nobody noticed until one guy went git-bisecting. This is why “it still asks for the password” is not the same as “the key is gone.”