Right. The value has not been lost. It has been shifted. It happens.
Let's say you work from home and make your lunch. Previously you'd buy ready-to-eat lunch. While you still buy ingredients and pay for energy, you don't pay for someone to prepare it and then sell to you, prepare the housing of the eatery and so on. Effectively some GDP was lost. Next, let's say you grow some of your own veggies...