@Matua This looks like a bug, but a minor one. The bombing damage is being applied directly to your PU's rather than as a damage to the factory. Therefore there is nothing to repair. This was the standard rule in earlier versions of A&A.
However, I don't see why that is happening. The XML has the correct value.
<property name="SBR Affects Unit Production" value="true" editable="false"> <boolean/> </property>
This property has been superseded by "Damage From Bombing Done To Units Instead Of Territories" but it should still work.
You should submit a bug report.