[BUG]: Show error for circular type references

**To Reproduce**
Steps to reproduce the behavior:
1. create type_1
2. create type_2
3. add a field in type_1 with type type_2
4. add a field in type_2 referencing type_1

**Expected behavior**
An error should appear in the issues box in the side bar

**Additional context**
The solution should be added in `issues.js`

