Detatchers disfunctional after reconnecting with main craft

Steps to reproduce:

IMPORTANT: Please focus on the orange part of the craft, and in case the stage activation is messed up, manually activate the following parts:
- Side detacher, Left side closest to gun breech (Left if you look to the back of the gun breech, and side detatcher under the orange support)
- Detatcher on the second shell (1st shell fires automatically, 2nd shell rolls into breech after following the steps above)

1. Once you start, wait until the first shell fires automatically.
2. Since the program automatically pauses the game after 1 second of firing, you must unpause the game again.
3. Manually destroy the "casing" that is left in the breech.
4. Activate the next stage, causing the shell to slide into the breech, and wait approx. 5 seconds for it to attach itself to the docking port.
5. Once docked, carefully activate the next stages until the shell "fires" (which it doesn't)