Add Xaero Waypoint requires world rejoin to appear after chat confirmation

[HKHCCcc]

Context

• SeedMapper version: SeedMapper-CevAPI 2.24.0-CevAPI v0.21
• Java version: 26.0.1
• Operating system: Windows 11
• System architecture: x86_64

Describe the bug
After clicking the "Add Xaero Waypoint" button on the map, the chat outputs Added Xaero waypoint..
The waypoint will not show up immediately. It only becomes visible after rejoining the world or server.

To Reproduce

1. Join server / load single-player world
2. Open SeedMapper menu, right click anywhere on the map
3. Click "Add Xaero Waypoint"
4. Check Xaero waypoint list (U key) — no waypoint visible
5. Reconnect server / re-enter world, then check again, the waypoint appears

Expected behavior
A waypoint should be immediately visible inside Xaero at the corresponding coordinates without rejoining.

Additional context
The only related content in log:
[21:22:45] [Render thread/INFO]: [System] [CHAT] [21:22:45] Added Xaero waypoint.

• Xaero's Minimap and Xaero's World Map are both installed.