[vim/vim] Regression: Compound mapping do not show the full output (Issue #21098)

sukima created an issue (vim/vim#21098)

### Steps to reproduce

Regression introduced in commit 6025ea9e029b0681df37ee19e0d3992fb7f4d7fd (tag: v9.2.0967)

The following [suggestion](https://vi.stackexchange.com/a/2187) no longer works like is did.

1. run `vim foo bar baz`
2. Type `:nnoremap <Leader>b :ls<CR>:b<Space>
3. Type `<Leader>b`

### Regression result

```
:b ▐
```

### Expected behaviour

```
:ls
  1 %a   "foo"                          line 1
  2      "bar"                          line 0
  3      "baz"                          line 0
:b ▐
```

### Version of Vim

9.2.0967

### Environment

Operating system: Ubuntu 22
Terminal: Ghostty
TERM = screen-256color
Shell: Bash 5.1.16(1)-release

### Logs and stack traces

```shell

```

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