Error in execute extended command minibuffer

[nameiwillforget]

I'm working on an elisp project containing the macro

(defalias 'Daselt-basic/indent-item
  "This macro automatically re-indents items and similar entries in LaTeX-mode."
  (kmacro "<kp-enter> C-S-<backspace> C-a"))

if I evaluate this macro on a freshly started Emacs instance, open execute extend command and narrow the selection until the macro should appear, I obtain the error message

Error in post-command-hook (vertico--exhibit): (wrong-type-argument stringp #[256 "\301\242\302��\305\300�\306#\210\301\240*\207" [[kp-enter C-S-backspace 1] (0) "%d" kmacro-counter-format-start kmacro-counter execute-kbd-macro kmacro-loop-setup-function] 5 kmacro])

This was tried with Vertico freshly upgraded.