Panic -> crash

**Describe the bug**
The more functions I profile the more often I get a panic from puffin.

**To Reproduce**
Unforutnatelly I do not have an reproducible example, I can share a game (15GB) and instructions...

**Expected behavior**
No panic.

**Device:**
- OS: Windows 11

**Additional context**
panic:
> .cargo\registry\src\index.crates.io-1cd66030c949c28d\puffin-0.19.0\src\frame_data.rs:455:18:
> We should have an unpacked frame if we don't have a packed one

I suspect it might be related to the threading model I use, but I would still expect it to not panic.
The game have two threading options:
- Do most things on main thread
- this panic only very rarely
- in this mode I call `new_frame` in **main** thread
- **and** majority of profiling events happen in **main** thread too
- `egui::profiler_ui` have its own thread, there is 32 threads, that have few profiling event
- Rendering and game logic separated
- the panic happens relatively often
- in this mode I call `new_frame` in **main** thread again
- **but** majority of profiling events happen in **other** threads
- `egui::profiler_ui` have its own thread, there is 30 threads, that have few profiling event