Bombs and trebs doing less damage to vaults

We removed an enemy treb mounted on top of a vault yesterday. When we attempted to treb away the vault we noticed that both bombs and treb have limited effect on vaults, less than half of the effect the same weapon has on t3 pieces. The vault has 150K in the tool tip, but it took quite some time to remove it. Has it been like this since vaults were nerfed to 150K?

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