Not sure whether this has to do with the other one.

I am on another machine, it is GNU Emacs 26.3 (build 2, x86_64-pc-linux-gnu, GTK+ Version 3.24.20) of 2020-05-17, modified by Debian

Anyway, I do this:

2 RET

;; display in hexa

d 6 RET

;; Raise to the power 32

32 ^

;; Shitf right by 30

C-u 32 b r

;; I get 0, whereas I expected 4

I have the impression that the old bigpos bigneg lisp based big intergers have been replaced by C bigintegers, and this is the root of all these regression.

Well, just a speculation.

  V.