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There are (often) cases where negative sides of power supplies must be wired together, but usually not at the power supply, it is done on equipment from one part to another. This avoids loops and keeps stuff at the same potential.
There are cases where this is not allowed at all.
So the short answer is yes and no, you have to know what you are dealing with to know if this can be done or not, and is not something you can just read on the internet, it requires deeper knowledge of the subject.
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It is easier to answer if you give us exactly what you need to do.

I was not implying there was an issue with the subroutines. While I don't use them as much as you, I have used them quite a bit without any problem. Additionally, my machine is a Bridgeport BOSS, which is quite rigid.

Having a log would provide the facts of what really happened, rather than relying on what I think I saw. Again, as probing has worked flawlessly, I was not 100% focused on the details. It looked like it triggered on the Z and kept going. I always test the probe connection prior to probing, with a manual trigger. So knowing if it triggered, how many times, the feedreate and movement, in chronological order, I could solve this definitively. I was thinking of saving the last 2-3 probes and rolling the logs so one the past probing, but not wasting disk space

The .txt file is actually a .sh file but I can't upload it here