v4 Regression - ecs_ensure_id in hook causes INTERNAL_ERROR

[cmbartschat]

Describe the bug

1. Create a world, 2 components, and an entity
2. Configure an on_add hook on component 1
3. Defer the world
4. Add component 1 to an entity
5. Return the world to non-deferred
6. The on_add hook runs
7. The callback calls ecs_ensure_id on the entity for component 1 and component 2
8. This results in an internal assertion failure

fatal: entity.c: 4689: assert: i != diff->added.count INTERNAL_ERROR
1   ecs-hook-test                       0x00000001004f6dfc ecs_log_ + 512
2   ecs-hook-test                       0x00000001004f6328 ecs_assert_log_ + 388
3   ecs-hook-test                       0x000000010051de74 flecs_defer_end + 4816
4   ecs-hook-test                       0x000000010052abb8 flecs_ensure + 844
5   ecs-hook-test                       0x0000000100532e18 flecs_set_id_move + 380
6   ecs-hook-test                       0x000000010051ee00 flecs_defer_end + 8796
7   ecs-hook-test                       0x000000010051ba34 ecs_defer_end + 304
8   ecs-hook-test                       0x0000000100435fb0 _ZN26EcsHookTest_OnAddHook_Test8TestBodyEv + 1108
9   ecs-hook-test                       0x0000000100486eb4 _ZN7testing8internal35HandleExceptionsInMethodIfSupportedINS_4TestEvEET0_PT_MS4_FS3_vEPKc + 292

This didn't happen on Flecs 3.2.12 (3210bff)

To Reproduce

#include "flecs.h"
#include "gmock/gmock.h"
#include "gtest/gtest.h"

typedef struct {
} EmptyComponent1;
ECS_COMPONENT_DECLARE(EmptyComponent1);

typedef struct {
} EmptyComponent2;
ECS_COMPONENT_DECLARE(EmptyComponent2);

class EcsHookTest : public ::testing::Test {};

void addHook(ecs_iter_t *it) {
  ecs_world_t *world = it->world;
  for (int i = 0; i < it->count; i++) {
    ecs_entity_t entity = it->entities[i];
    ecs_ensure_id(world, entity, ecs_id(EmptyComponent1));
    ecs_ensure_id(world, entity, ecs_id(EmptyComponent2));
  }
}

TEST_F(EcsHookTest, OnAddHook) {

  ecs_world_t *world = ecs_init();
  ECS_COMPONENT_DEFINE(world, EmptyComponent1);
  ECS_COMPONENT_DEFINE(world, EmptyComponent2);

  ecs_entity_t eid = ecs_new(world);

  static const ecs_type_hooks_t hooks = {
    .on_add = addHook,
  };
  ecs_set_hooks_id(world, ecs_id(EmptyComponent1), &hooks);

  ecs_defer_begin(world);
  ecs_ensure_id(world, eid, ecs_id(EmptyComponent1));
  ecs_defer_end(world);
}

Expected behavior

Flecs's internal state should remain consistent during this operation, and not crash