Barline showing when asked not to

This is a strange or unusual thing to do, but I'm still going to show the steps nontheless in hopes of some feedback.

1) Start a grand staff score

2) Add an extra staff in the instrument so that there is a 3 staff instrument and move it to the top of the list

3) On the top most staff, in Staff properties if you check "Hide System barline", the initial barline is no longer showing. Customarily I delete the staff bracket and make the staff small, hide measure lines etc. and add a custom bracket to drag across all three staves. All is fine. Result is unusual but it looks okay and works:

4) Now, if you take that top most staff and put it in the bottom instead of the top of the instrument (and do some tweaking with the instrument brace), the barline will be showing: you can't get rid of it even if the "Hide System barline" is checked. The ending barline is hidden because Show barlines is unchecked

My question: is there a way to get that initial barline to not show on the lower staff so that it will look like it did as it was on the top? If not, it would be nice if it worked like it does with the above staff. This may be normal behavior, but that's not the point. Why does the Hide System Barline option only work for the top staff and not the bottom one, and again is there a way to change this some how that I've overlooked? Thanks for taking the time to read and for any future response. Stay warm.

P.S. it also doesn't work for a new instrument rather than an extra staff of the same instrument.
P.P.S. This isn't that big of a deal but it's something I found while tweaking the settings.