React Compiler doesn't memoize class instances or their dependents without explicit useMemo

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Summary

React Compiler doesn't memoize:

1. Class instance creation (new Class())
2. Any expression that depends on that class instance

This means that a single un-memoized class instance "poisons" the entire dependency chain —
even expressions that could theoretically be safely memoized are skipped.

Reproduction

Playground link (with useMemo):
https://playground.react.dev/#N4Igzg9grgTgxgUxALhAgHgBwjALgAjggDswCBZATwAkIIBrfAXnwAoBKZgPn2AB1i+IYRJl8kALYIAwgBsAhmDABJUrnnFEzfFDAJyCCRFYdu+YggDu+OYrAcANPgDaAXXYDhIteIm4AFtqSMgpKqmQaiAB0AGZ0rOgegsIwCLiwgmB+-gIAvgDcIA4gRMQxAJYA5igg5RLYePi4lJgIvPgACrJQleXEAPKYuOWi+Ln4MTAQEvgA5ABG8vMIsgC0mN29xKup8nC4q0T15bIIMAD0ACblZLP5AgKs-Mnn50eYJ-LDJOQQlwjIfB8EDyWSyYF5cRfG4VBBgTqbPqDb6kdiFYpgfwQSyqXBnYigsAoGKEhC5IA

With useMemo, the compiler memoizes both someClassInstance and smth variables. Once useMemo is removed, all memoization is gone.

Questions

1. Is this expected behavior or a limitation?
2. What determines whether an expression's dependencies are "stable" enough for memoization?
3. Is there documentation about this?