Not sure if this is a bug or not.
When the routing of a device, for example, Stereo Panner is set to the master mode everything is ok and sounds as it's supposed to.

And on E4L Master Bus I get these levels on the meter:

All 16 channels are used. Pay attention on the "pattern" of the levels.

But when the routing is set to the chain mode, only 14 channels are used and it sounds not as expected.

As you can see it looks like it starts from the 3rd channel and the first two channels are lost.

For fixing that I added +1 block in e4l.bus.send.maxpat:

Laptop: Apple M1 Pro
OS: Mac OS Sonoma 14.0 (23A344)
Live: 11.3.13
Max: 8.5.5