Whit this selection, LH show “Links don´t have discernible name” in the arrows symbols.
These arrows are buttons, so the bitton text normally act as the dicernible name, but these don´t have it.
I know, thi´s an alpha version, report here for knowledge.
Maybe an aria-label is needed.
No. I´m talking about elements -> Post Navigation -> templates -> two columsn with arrows.
These use the Generate Blocks buttons.
But I don´t realize that in Advanced Optios is the place to set the aria-label, then I found it and have closed the issue.
Thx for you time Elvin.