--marker '═' --marker-multi-line '╔║╚' does not take effect?

[tmpm697]

Checklist

• [X] I have read through the manual page (man fzf)
• [X] I have searched through the existing issues
• [X] For bug reports, I have checked if the bug is reproducible in the latest version of fzf

Output of fzf --version

0.53

OS

• [ ] Linux
• [X] macOS
• [ ] Windows
• [ ] Etc.

Shell

• [ ] bash
• [X] zsh
• [ ] fish

Problem / Steps to reproduce

I'm kinda confuse, I have:

export FZF_DEFAULT_OPTS=

declare -f |
  perl -0 -pe 's/^}\n/}\n\0/gm' |
  bat --plain --language bash --color always |
  fzf --read0 --ansi --layout reverse --multi --highlight-line

which is code from https://junegunn.github.io/fzf/tips/processing-multi-line-items/#all-bashzsh-functions-highlighted but i didn't see two marks as below image in the same link, i only see the red one (outer one), not the pink one(inner or right one).

image from my pc

[junegunn]

Markers are for --multi. They appear when you select items using TAB or SHIFT-TAB.