Bugzilla

This seems to be a debug-only assert:
https://searchfox.org/mozilla-central/rev/5c2888b35d56928d252acf84e8816fa89a8a6a61/servo/components/style/custom_properties.rs#2061
```rust
debug_assert!(v.is_parsed(registration), "Should be already computed");
```

...and I'm not immediately seeing a crash when I visit the site with a regular Nightly, so I'm assuming/hoping this doesn't cause must observable trouble for users.  Hence, triaging as S3.

(emilio, would you mind double-checking me on that -- i.e. is this assertion particularly concern-worthy -- and maybe see if a quick look at the pernosco trace has any clues about what's gone wrong?)

This seems to be a debug-only assert:
https://searchfox.org/mozilla-central/rev/5c2888b35d56928d252acf84e8816fa89a8a6a61/servo/components/style/custom_properties.rs#2061
```rust
debug_assert!(v.is_parsed(registration), "Should be already computed");
```

...and I'm not immediately seeing a crash when I visit the site with a regular Nightly, so I'm assuming/hoping this doesn't cause much observable trouble for users.  Hence, triaging as S3.

(emilio, would you mind double-checking me on that -- i.e. is this assertion particularly concern-worthy -- and maybe see if a quick look at the pernosco trace has any clues about what's gone wrong?)