hash-table fails to remove key

[Eric Diethelm]

When using a hash-table as key in another hash-table with :test #'equal, removing the key fails.

Code to reproduce:
(let ((object (make-hash-table))
      (store (make-hash-table :test #'equal)))
 (format t "Add: ~a~%" (setf (gethash object store) '(1 2 3)))
 (format t "Seek: ~a~%" (gethash object store))
 (format t "Remove: ~a~%" (remhash object store)))

Output:
Add: (1 2 3)
Seek: (1 2 3)
Remove: NIL

Expected output:
Add: (1 2 3)
Seek: (1 2 3)
Remove: T

Note: The expected behaviour - successfully removing the key - worked with SBCL 1.5.4 under Linux and Windows 7.

SBCL Versions:
2.0.0 on Windows 7
2.0.1 on Linux

uname -a
Linux laptop-eric 4.19.0-6-amd64 #1 SMP Debian 4.19.67-2+deb10u2 (2019-11-11) x86_64 GNU/Linux

*FEATURES*
(:CLOSER-MOP :5AM :SBCL-DEBUG-PRINT-VARIABLE-ALIST :BORDEAUX-THREADS
 ALEXANDRIA.1.0.0::SEQUENCE-EMPTYP :THREAD-SUPPORT :SWANK :QUICKLISP
 :SB-BSD-SOCKETS-ADDRINFO :ASDF3.3 :ASDF3.2 :ASDF3.1 :ASDF3 :ASDF2 :ASDF
 :OS-UNIX :NON-BASE-CHARS-EXIST-P :ASDF-UNICODE :X86-64 :64-BIT :ANSI-CL
 :COMMON-LISP :ELF :GENCGC :IEEE-FLOATING-POINT :LINUX :LITTLE-ENDIAN
 :PACKAGE-LOCAL-NICKNAMES :SB-LDB :SB-PACKAGE-LOCKS :SB-THREAD :SB-UNICODE
 :SBCL :UNIX)