Failing assert iOS C++ Unit Tests

[louwers]

When running the iOS C++ Unit Tests from main, this assert fails in Map.PrefetchTiles.

maplibre-native/src/mbgl/mtl/drawable.cpp

Lines 194 to 196 in a4258cc

	if (!impl->indexes->getBuffer() || impl->indexes->isModifiedAfter(attributeUpdateTime)) {
	assert(!"Index buffer not uploaded");
	return;

This line from the test is being executed.

checkTilesForZoom(10, {11, 11, 11, 11, 11, 11, 11, 11, 11});

[louwers]

Seems to happen after #2668

cc @alexcristici