I use version 1.12.2-4.9.1.92.

1. After one frame/cover/cable/framed cable is broken, if the mouse button is still pressed, all other elements behind broken piece start breaking as if creative mode is on.

2. The frame can be broken through cover/panel. If its a feature, can it be disabled in the config?

3. Buttons/redstone electronics sometimes become "stuck": button won't unpress itself, gates won't unpower, etc. This may fix itself on block update, but I'm not sure. The ship I've built almost escaped due to that. This happens when I move it into to East direction.

4. I'm against the feature of frame transparency (when you can place blocks/covers on other side - not the one you're pointing at). It does more harm than help. Can it be disabled by config?

5. Optional: Sometimes, frames don't catch motors: frame touches the side of the motor, but doesn't drag it. This also happens when I move my ship to East. I d unno, maybe its a feature and motors are only being dragged by frames that touch their back side.

6. Hitboxes of objects being moved desync with their image (they are behind the image). Combined with 1) and 2), the attempt to break the button (that orders going forward one block) that got stuck leads to massive damage to the ship.

7. Blocks that were part of the ship lag when broken - the breaking sound is there, but the block seems to be in place. It breaks itself after a certain period of time.

8. Unrelated, but nonetheless: placed power cable has the hitbox of a panel.

I can provide the world with a ship which demonstrates the issues, if you need.