I checked the failing limt one and it worked fine. Maybe it was fixed recently?

  ;;; Loading #P"/usr/lib/ecl-21.2.1/sb-bsd-sockets.fas"
  ;;; Loading #P"/usr/lib/ecl-21.2.1/sockets.fas"
  Maxima 5.46.0 https://maxima.sourceforge.io
  using Lisp ECL 21.2.1
  Distributed under the GNU Public License. See the file COPYING.
  Dedicated to the memory of William Schelter.
  The function bug_report() provides bug reporting information.
  (%i1) declare(a,real);
  (%o1)                                done
  (%i2) declare(b,real);
  (%o2)                                done
  (%i3) assume(a>b,b>0);
  (%o3)                           [a > b, b > 0]
  (%i4) limit(log(b-a+%i*eta),eta,0,plus);
  (%o4)                         log(a - b) + %i %pi
  (%i5) limit(log(b-a+%i*eta),eta,0,minus);
  (%o5)                         log(a - b) - %i %pi

Version I've installed is 5.45.1 and gets "log(b - a) + %i %pi" and "log(b - a) - %i %pi", so should be. Gave changelog for 5.46.0 a look but not sure whether it had a direct fix for this or was indirectly fixed due to one of the other closed bugs.

Hmm, there is a weird fix with the limits, could be #484: limit(x=0,x,0) wrong