13.0 pxeboot stopped working

From: Daniel Braniss <danny_at_cs.huji.ac.il>
Date: Tue, 16 Nov 2021 06:35:34 UTC
so far I have tried 3 different hosts, and they all fail:
0ne reports something like NBP too big
another crashes the BTX
a third just goes south/hangs.

will continue testing, but insights are more than welcome,