This is more serious bug than i thought before

This bug not with battle in garage with robot but with any battle (potentially)
Got same problem after battle with clones

Older post below -

After i killed Robot in Garage with ability "Hack Robot" my save game and quicksave buttons blackout. Autosave seems also stopped working,
I don't know if this is happed because i killed Robot using Ability instead using guns.
Save and quick save functions was restored only after i exit and then enter Rangers base.