As many of you possibly are aware of, your sentry is a total write-off when a boss uses a stun rage while you build or upgrade it.
It has no ammo whatsoever and doesnt move until you upgrade it again or destroy and rebuild it.
Is that intentional? And if not, could someone try to fix it?
Thx

You have to "upgrade it again or destroy and rebuild it."

It's expensive on metal to do either action.