Backflush indicator for components at Recipe(Routing)

Hello

For Auto GI of components, We have assigned Backflushing indicator directly at Master Receipe (Routing).

Backflush indicator is Blank at MRP2 view& Work centres.

While Creation of process order, If however I change the resource allocated in operation XXXX from resource AAAA to alternative resource BBBB, then return to the material tab I can see that material component is no longer flagged for backflushing.

Please guide why backflushing indicator of components is getting removed by changing resource.