renderComponent: `Uncaught TypeError: Cannot read property 'syscall' of null`

[NullVoxPopuli]

🐞 Describe the Bug

Fairly easy to reproduce.

Render multiple things with renderComponent at once (nested, etc).

I had previously shipped the removal of rendering a whole app per "island" in favor of renderComponent here:

• https://github.com/NullVoxPopuli/limber/pull/1977/changes#diff-cff07c767c0dc2363d9e2fdac05860d3f49b1774636007893d517fe163e5d217

But had to revert to renderComponent not actually being robust enough for this use case.

I suspect this may block usage in the more intended use case, which is ag-grid, tanstack table, etc.

🔬 Minimal Reproduction

https://github.com/vlascik/repro-renderComponent

😕 Actual Behavior

VM Crash

🤔 Expected Behavior

No VM Crash

🌍 Environment

• Ember: 6.8.2+

➕ Additional Context

Add any other context about the problem here.