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Mesh.MergeMeshes crashes on more than 65336 vertices mesh with allow32BitsIndeces on - BUG

See original GitHub issue

BABYLON.Mesh.MergeMeshes(…) crashes if the meshes to merge have more than 65336 even though flag allow32BitsIndices = true.

Attached is a full test suite with html, gtlf file, bin, and textures. The file includes an html to run on local server, which will load a gltf that has multiple meshes of the same material, with more than 65536 vertices.

An attempt to merge all meshes with same materials is done on lines 118 - 147 of the bug.html script, producing a failure.

Function: BABYLON.Mesh.MergeMeshes(meshesWithSameMaterial, disposeSource, allow32BitsIndices, meshSubclass, subdivideWithSubMeshes);

Result: TypeError: this.indices.push is not a function

babylon.js:1 BJS - [01:53:21]: Error running tasks-done callbacks.
m._ErrorEnabled @ babylon.js:1
e._decreaseWaitingTasksCount @ babylon.js:1
(anonymous) @ babylon.js:1
e.onDoneCallback @ babylon.js:1
(anonymous) @ babylon.js:1
(anonymous) @ babylon.js:1
f @ babylon.js:1
(anonymous) @ babylon.js:1
Promise.then (async)
(anonymous) @ babylon.js:1
f @ babylon.js:1
o @ babylon.js:1
XMLHttpRequest.send (async)
l @ babylon.js:1
n @ babylon.js:1
m.LoadFile @ babylon.js:1
g @ babylon.js:1
r @ babylon.js:1
(anonymous) @ babylon.js:1
load (async)
c._checkManifestFile @ babylon.js:1
c @ babylon.js:1
P._loadData @ babylon.js:1
P.ImportMesh @ babylon.js:1
e.runTask @ babylon.js:1
e.run @ babylon.js:1
e._runTask @ babylon.js:1
e.load @ babylon.js:1
createScene @ bug.html:163
(anonymous) @ bug.html:170
babylon.js:1 TypeError: this.indices.push is not a function
    at q.merge (babylon.js:1)
    at Function.p.MergeMeshes (babylon.js:1)
    at e.assetsManager.onFinish (bug.html:144)
    at e._decreaseWaitingTasksCount (babylon.js:1)
    at babylon.js:1
    at e.onDoneCallback (babylon.js:1)
    at babylon.js:1
    at babylon.js:1
    at f (babylon.js:1)
    at babylon.js:1

bug.zip