Hi,
I found that the PLAN Mode of the ND haven't a no ADIRS mode, if a make FPLN in the MCDU without ADIRS on (wich is in theory impossible) the PLAN page is showing up normally, so there is missing a "MAP NOT AVAIL" in this mode.

Should be this :

Seems that's intended and normal behavior.
https://youtu.be/MywqXeeoYos?t=746
I think its more that the aircraft needs to be invisible in plan mode when irs has not aligned yet
Most helpful comment
Seems that's intended and normal behavior.
https://youtu.be/MywqXeeoYos?t=746