many_foxes and other animation examples have stopped working #20383
Description
Bevy version
Relevant system information
SystemInfo { os: "Windows 10 Pro", kernel: "19045", cpu: "AMD Ryzen 9 7900 12-Core Processor", core_count: "12", memory: "63.2 GiB" }
AdapterInfo { name: "NVIDIA GeForce RTX 4060", vendor: 4318, device: 10370, device_type: DiscreteGpu, driver: "NVIDIA", driver_info: "572.83", backend: Vulkan }
What you did
cargo run --example many_foxes
cargo run --example morph_targets
What went wrong
The meshes do not animate.
Additional information
I think the problem is due to the mesh scenes getting respawned after the example's scene setup has run. I tagged a few functions and got this log:
[crates\bevy_scene\src\scene_spawner.rs:324:9] "spawn_sync_internal"
[crates\bevy_scene\src\scene_spawner.rs:324:9] "spawn_sync_internal"
[crates\bevy_scene\src\scene_spawner.rs:324:9] "spawn_sync_internal"
[examples\stress_tests\many_foxes.rs:240:9] "setup_scene_once_loaded"
[crates\bevy_scene\src\scene_spawner.rs:324:9] "spawn_sync_internal"
[crates\bevy_scene\src\scene_spawner.rs:324:9] "spawn_sync_internal"
[crates\bevy_scene\src\scene_spawner.rs:324:9] "spawn_sync_internal"
Before the change, there are no calls to spawn_sync_internal after the setup_scene_one_loaded.
Other examples that rely on scene spawning observers or Added<AnimationPlayer> are not affected. If I hack the broken examples to use Added<AnimationPlayer> then they start working.