This is what i see when i run pulumi up

Type                              Name                                                                 Plan
     pulumi:pulumi:Stack               mgmt-vpc-mgmt-vpc-prod
 +   ├─ aws:ec2:RouteTableAssociation  <pulumi.output.Output object at 0x1052d64d0>route_table_association  create
 +   ├─ aws:ec2:RouteTableAssociation  <pulumi.output.Output object at 0x1052bd890>route_table_association  create
 +   ├─ aws:ec2:RouteTableAssociation  <pulumi.output.Output object at 0x1052e9b90>route_table_association  create
 +   ├─ aws:ec2:RouteTableAssociation  <pulumi.output.Output object at 0x1052e9210>route_table_association  create
 -   ├─ aws:ec2:RouteTableAssociation  <pulumi.output.Output object at 0x105a8f190>route_table_association  delete
 -   ├─ aws:ec2:RouteTableAssociation  <pulumi.output.Output object at 0x105aa8350>route_table_association  delete
 -   ├─ aws:ec2:RouteTableAssociation  <pulumi.output.Output object at 0x105a44650>route_table_association  delete
 -   └─ aws:ec2:RouteTableAssociation  <pulumi.output.Output object at 0x105aa87d0>route_table_association  delete

Outputs:
  + privatename     : "<pulumi.output.Output object at 0x1052bd890>route_table_association"

Resources:
    + 4 to create
    - 4 to delete
    8 changes. 18 unchanged

it recreates the routetable assodication.