Reproduction steps:
1. Create a new project
2. Import Bolt and FMOD ("FMOD for Unity" in Asset Store)
3. In the top-left menu bar navigate to Tools > Bolt > Unit Options Wizard
4. Add "FMODUnity" to the Assembly list and Generate Unit Options
5. Enter Play Mode
6. Exit the Play Mode and navigate to Tools > Bolt > Unit Options Wizard

Expected result: "FMODUnity" is not removed from the Unit Options when entering Play Mode
Actual result: "FMODUnity" is removed from the Unit Options when entering Play Mode (See attached FmodBoltUnityOptions.mp4)

Reproduces on: Bolt 1.4.13 (2018.4.30f1, 2019.4.16f1, 2020.1.16f1, 2020.2.0b14, 2021.1.0a8)

Notes:
-Error outputted when Generating Unit Options:
Failed to save option 'Bolt.LiteralOption'.
System.Runtime.Serialization.SerializationException: Serialization of 'Bolt.Literal' failed. ---> System.OverflowException: Value was either too large or too small for an Int64.
-Issue also occurs when restarting Unity