In v1.20, I still have "Compressed Fuel Storage System - Small" components available in the Ship Design window. I started a new game, but did not use any auto-tech or auto-start options. I used my instant research points, but not in anything related to this tech.
Also, small/tiny/fighter-sized fuel tanks and engineering spaces are available at start. Not sure if intended. I didn't use any instant research points to unlock them.

Small engineering and fuel working as intended.
You using the latest AuroraDB.db? The Compressed Fuel Storage System - Small is flagged at Ruin-only in the latest db.
Yes, it was like this in the earlier versions and like this in my new v1.20 game, as well. Someone else in a previous bug thread also confirmed they were getting this.
Reproduction steps are easy:
1) Create a New Game. No need to change any options.
2) Open up ship design and create a new class.
3) Compressed Fuel Storage System - Small shows as a component to add to your ship designs.