LS: Investigate `IndexMap: key not found` error

[Draggu]

Sometimes LS reports errors like this

thread 'main' panicked at crates/cairo-lang-defs/src/db.rs:585:15: IndexMap: key not found

thread 'main' panicked at crates/cairo-lang-defs/src/db.rs:289:75: IndexMap: key not found

errors have different origins but this always happens when indexing.

Find out why this is happening and if is this LS or compiler error