Kitty graphics fail in Zellij with explicit placement IDs

Kitty graphics fail in Zellij when an image is uploaded with a=t and then displayed with separate a=p commands carrying explicit placement IDs.

The same sequence works in Kitty: it displays a 2x2 image, moves a placement when the same (image ID, placement ID) pair is reused, and removes a placement with a=d,d=i. In Zellij, the placements are not rendered or updated correctly.

I'm aware that https://github.com/zellij-org/zellij/pull/5428 mentioned Unicode placeholders are not supported at the moment, but Kitty placements are separate features and can be used without Unicode placeholders - the repro below sends no U=1, nor write Unicode placeholder chars at all, and it only tests regular Kitty image placements with explicit IDs.

Repro

Run this directly in Kitty, then run it from a pane inside Zellij:

#!/bin/sh

payload=/wAAAP8AAAD/////

place() {
  printf '\033[%s;%sH\033_Gq=2,a=p,i=42,p=%s,x=%s,y=%s,w=1,h=1,c=1,r=1,z=-1,C=1\033\\' \
        "$1" "$2" "$3" "$4" "$5"
}

# 2x2 RGB image: red, green, blue, white
printf '\033_Gq=2,a=t,i=42,f=24,s=2,v=2,m=0;%s\033\\' "$payload"

place 1 1 1 0 0
place 1 2 2 1 0
place 2 1 3 0 1
place 2 2 4 1 1

sleep 2

# Reuse placement ID 1 at a new position
place 4 4 1 0 0

sleep 2

# Delete placement ID 2
printf '\033_Gq=2,a=d,d=i,i=42,p=2\033\\'

Expected

• 4 colored cells appear
• placement p=1 moves to row 4, column 4
• placement p=2 disappears

Actual

The placements are not displayed or updated as expected.

Environment

• Zellij 0.45.1
• Kitty 0.48.2