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XIM input sometimes jumbled

Which distribution and version?: Fedora Linux

Which desktop environment and version?: GNOME

Which session type?: Wayland and Xorg

IBus version?: 1.5.29-rc1 and earlier

Issue description: Direct input to an X app can get scrambled (misordered) sometimes.

Prepare environment: eg in Fedora 39 Gnome with XMODIFIERS=@im=ibus:

$ sudo dnf install evemu xterm
$ xterm &
$ wget https://gitlab.gnome.org/GNOME/gnome-shell/uploads/638f63efdb622745be311187c435234a/log.txt
$ sudo evemu-play log.txt

Steps to reproduce:

  1. press Enter after Hit enter to start replaying
  2. immediately press Alt-Tab to switch the focus to the X app (xterm)
  3. watch the input
  4. when it stops Alt-Tab back to the terminal and repeat from step 2

Eventually the input appearing in input the X app becomes misordered/jumbled/scrambled:

mreoac-@talklanet#1alknaelt#1anll#a1ketalklanet#1akalln#et1alklaten1#@tea-rmocakll1tna#e

versus expected input:

@team-rocalklanet#1alklanet#1alklaneT#1...

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