Older devices weren't bi-di so you would need to manually program finishers, trays and XSA setups etc. Now it is all done automagically ;-) , so yes this is a relatively new thing (about 1.5 to 2 years)
Tray 5 specifically is most of the time what is causing it for the reason you list.
You cannot tell it what to look for from the printer or the driver (both Windows and Mac)
So the error will stay unless you lose all the nice features to get rid of the minor annoyance of the triangle by using a one way comm, such as HP Jet direct, which is equivalent to RAW on a PC, with SNMP disabled.
was this alert always the case? i dont remember this with older xerox devices in the past
tray 5 is 99% empty, so there will always be an alert on mac
is it possible to disable alerts for a specific tray? maybe with some NVM value or something?
Can we assume this is an Apple Mac device?
If it is, then it is a caution sign, typically from supply levels or from tray 5 being empty, not a stop, so printing can continue.
In Windows you only get the results in the driver
In OSX you get it on the printer name as well, sort of a notification to look deeper.
The only way to stop them from displaying is to kill bi-di in the driver. Easiest way to do that is to install the printer on the Mac manually and choose HP Jet Direct as the port, which does not support the bi-directional capabilities.
When I go into the print menu, the dropdown menu that shows my printers has a small triangle icon with an eclamation mark beside the option for our Xerox 7855.
Print jobs still go through perfectly fine.
Why is this icon showing? It's a bit annoying to see.
All paper trays are full, nothing is stuck in queue.