_node/stats/pipelines API only returns one pipeline stats

Hi,

We've been using this API to monitor the persistent queue health of our multiple pipelines.. we ran through a couple of upgrades from 6.X to 7.3.0, and now this API call only returns stats on one pipeline.. when previously, and as per current doco, it should return stats on ALL pipelines on the LS instance? Anyone else noticed this?

TIA