Bridges, either gas or liquid, when splitting their element to two or more different pipes will start behaving like regular pipes in regards to the "pause and check" of a junction.
There is no smoothness of pipe flow when one of the bridge splits has a limited or stalled flow. The split will NOT continue along the remaining open flow as if the piping had taken what was needed (which is the behavior of a bridge/building input with a limited or stalled flow at the output).
This behavior was not seen until patch 350563 was put in with the reintroduction of the pipe optimization. This behavior was not seen in the 349444 patch rollback.
If this is a new intended behavior then this was not specifically mentioned in the patches.
Steps to Reproduce
Have a liquid or gas bridge output split at minimum a T junction (reproducible as 3 or 4 way, but requires smaller flows), have one of the splits be either stalled or less than half the flow for that specific element (1/3rd for 3 way and 1/4 for 4 way) and the other split be continuous to allow flow.
This issue has not been confirmed by a developer yet.