frameset-to-register: Different from frame-configuration-to-register?

[T. V. Raman]

If you do C-x rf to invoke the new frameset-to-register -- and
later attempt to jump to that configuration via C-x rj it throws
an error like so:
this does not happen with the older command
frmae-configuration-to-register.

Debugger entered--Lisp error: (error "Register doesn't contain a buffer 
position or configuration")
  signal(error ("Register doesn't contain a buffer position or configuration"))
  error("Register doesn't contain a buffer position or configuration")
  #[513 
"\301!\302
!\203Y\211G\303Y\203Y\211\304H>\203Y\211\304H>\204&\305\306\307\310#\210\211\311H\2043\305\312\313!\"\210\211\304H>\204A\305\306\307\310#\210\211\311H
\304H>\204R\305\306\314\310#\210
\315H!\202\362\211:address@hidden@?\"address@hidden:address@hidden@address@hidden:address@hidden:address@hidden@address@hidden"address@hidden"
 [cl-struct-registerv-tags get-register vectorp 5 0 error "%s accessing a 
non-%s" registerv-jump-func registerv 3 "Don't know how to jump to register %s" 
single-key-description registerv-data 1 frame-configuration-p 
set-frame-configuration window-configuration-p set-window-configuration markerp 
marker-buffer "That register's buffer no longer exists" switch-to-buffer file 
find-file file-query find-buffer-visiting y-or-n-p format "Visit file %s again? 
" "Register access aborted" 2 "Register doesn't contain a buffer position or 
configuration"] 8 2384059 (byte-code "\301\302!D\207" [current-prefix-arg 
register-read-with-preview "Jump to register: "] 2)](102 nil)
  ad-Advice-jump-to-register(#[513 
"\301!\302
!\203Y\211G\303Y\203Y\211\304H>\203Y\211\304H>\204&\305\306\307\310#\210\211\311H\2043\305\312\313!\"\210\211\304H>\204A\305\306\307\310#\210\211\311H
\304H>\204R\305\306\314\310#\210
\315H!\202\362\211:address@hidden@?\"address@hidden:address@hidden@address@hidden:address@hidden:address@hidden@address@hidden"address@hidden"
 [cl-struct-registerv-tags get-register vectorp 5 0 error "%s accessing a 
non-%s" registerv-jump-func registerv 3 "Don't know how to jump to register %s" 
single-key-description registerv-data 1 frame-configuration-p 
set-frame-configuration window-configuration-p set-window-configuration markerp 
marker-buffer "That register's buffer no longer exists" switch-to-buffer file 
find-file file-query find-buffer-visiting y-or-n-p format "Visit file %s again? 
" "Register access aborted" 2 "Register doesn't contain a buffer position or 
configuration"] 8 2384059 (byte-code "\301\302!D\207" [current-prefix-arg 
register-read-with-preview "Jump to register: "] 2)] 102 nil)
  apply(ad-Advice-jump-to-register #[513 
"\301!\302
!\203Y\211G\303Y\203Y\211\304H>\203Y\211\304H>\204&\305\306\307\310#\210\211\311H\2043\305\312\313!\"\210\211\304H>\204A\305\306\307\310#\210\211\311H
\304H>\204R\305\306\314\310#\210
\315H!\202\362\211:address@hidden@?\"address@hidden:address@hidden@address@hidden:address@hidden:address@hidden@address@hidden"address@hidden"
 [cl-struct-registerv-tags get-register vectorp 5 0 error "%s accessing a 
non-%s" registerv-jump-func registerv 3 "Don't know how to jump to register %s" 
single-key-description registerv-data 1 frame-configuration-p 
set-frame-configuration window-configuration-p set-window-configuration markerp 
marker-buffer "That register's buffer no longer exists" switch-to-buffer file 
find-file file-query find-buffer-visiting y-or-n-p format "Visit file %s again? 
" "Register access aborted" 2 "Register doesn't contain a buffer position or 
configuration"] 8 2384059 (byte-code "\301\302!D\207" [current-prefix-arg 
register-read-with-preview "Jump to register: "] 2)] (102 nil))
  jump-to-register(102 nil)
  call-interactively(jump-to-register nil nil)
  command-execute(jump-to-register)