'Could not load file or assembly 'System.Text.Json, Version=5.0.0.0, Culture=neutral, PublicKeyToken=

Isn’t it strange that the error message indicates that the version 5.0.0.0 of System.Text.Json cannot be loaded? Isn’t package versioning always done with three digits (#.#.#)? I don’t think a version 5.0.0.0 of System.Text.Json even exists.