Version: 1.30.164200.56, PC Steam, Windows

Terrain: custom terrain, 20x20 km, world name islacero, mod @IslaCeroRD, mission dayzOffline.islacero

What happened:

A new custom terrain with no navmesh file yet cannot start in DayZ 1.30 at all, so the NavMeshGenerator can never connect to create the first navmesh.

The server reaches Loading landscape 'islacero' and then crashes:

AI (F): Unable to load navmesh for 'islacero'.

ENGINE (F): Crashed

Exception code: C0000005 ACCESS_VIOLATION

This was tested in all of these ways, all crashing at the same point:

1. Normal dedicated server: DayZServer_x64 -config=ServerDZ-IslaCero-Prueba.cfg -port=2302 -profiles=C:\DayZIslaCeroPrueba -mod=@IslaCeroRD

Result 2026-11-03 01:44: server reached Loading landscape 'islacero', then Unable to load navmesh, then Crashed, C0000005 at 714DF07C.

2. Navmesh data server: DayZDiag_x64 -server -mod=@IslaCeroRD -startNavmeshDataServer -port=2302 -config=ServerDZNV.cfg

Result 2026-11-03 01:21: same crash, C0000005 at 5C62A1EC.

3. Borrowed navmesh from Chernarus, by reference only: navmeshName = "\dz\worlds\chernarusplus\navmesh\navmesh.nm"

Result 2026-11-03 01:21: same crash at Loading landscape.

4. Borrowed navmesh from Nasdara, 1.30 format: navmeshName = "\dz\worlds\nasdara\navmesh\navmesh.nm"

Result 2026-11-03 01:48: same crash at Loading landscape, C0000005 at 5C62A1EC.

5. Isolated diagnostic copy, world name islacerodiag, config with NO Navmesh class at all, separate mod @IslaCeroDiagnostico, separate mission and profile, normal server port 2304

Result 2026-11-03 02:06: same crash at Loading landscape 'islacerodiag', AI (F): Unable to load navmesh for 'islacerodiag', ENGINE (F): Crashed, C0000005 at 714DF07C.

The official wiki says navmesh is not mandatory and the game will cope without it. In 1.30 it does not cope: the server cannot start at all, with or without the Navmesh class, with a missing navmesh, or with a borrowed navmesh from another world.

Expected result:

The server starts without a navmesh (AI frozen, as documented), or at least the navmesh data server stays up so the NavMeshGenerator can create the first navmesh for a new terrain.

Related issue: DZG-2465, where another custom map creator reports that generating new navmeshes for custom maps does not work in 1.30.

Attachments: RPT files from the normal server test, the Nasdara data server test, and the isolated diagnostic test.

1. Start a new custom terrain (20x20 km, world name islacero, mod @IslaCeroRD, mission dayzOffline.islacero) with no navmesh file yet, using a normal dedicated server.

2. Observe that the server reaches Loading landscape 'islacero' and then crashes with AI (F): Unable to load navmesh for 'islacero' and C0000005 ACCESS_VIOLATION.

3. Repeat with the navmesh data server (DayZDiag_x64 -server -startNavmeshDataServer); it crashes at the same point, so the NavMeshGenerator can never connect.

4. Repeat with a borrowed navmesh from Chernarus or Nasdara, and with an isolated diagnostic copy with no Navmesh class at all; all crash at Loading landscape.

The server starts without a navmesh (AI frozen, as documented), or at least the navmesh data server stays up so the NavMeshGenerator can create the first navmesh for a new terrain.