REPL variable corruption since 6.0

5.6 works as expected
from 6.0 onward I get the following result in the REPL where only the first variable in an expression is evaluated and the second variable is evaluated as equal to the first variable
any ideas?

<img width="795" height="389" alt="Image" src="https://github.com/user-attachments/assets/6d6f38f5-6347-49a5-b63c-b2f6b114eb33" />