Syntax error - mermaid version 11.12.0

Thanks for the bug report. Could you provide repro steps? It would be especially helpful if you could provide the markdown for the mermaid diagram that causes this. You could paste it into the bug report below if it doesn't contain any private information. Alternatively, use the /feedback command in the thread where you're seeing this and upload your session details, then paste the thread ID below.

Here I am posting the code of the diagram example that failed to display in the codex app, others were successfully displayed, but this one failed and probably resulted into the error:

flowchart LR
A["1. Mobile app"] --> B["2. API Gateway"]

B --> C["3. Lambda - event ingest<br/>(impression / swipe)"]
B --> D["4. Lambda - recommendation API"]

D --> E["5. ElastiCache"]
D --> M["11 & 15. Database upserts"]

C --> I["9. recommendation events queue"]
I --> J["10. Lambda - aggregate worker"]
I --> K["11. DLQ"]

J --> M
J --> L["12 & 16. CloudWatch alarm + SNS"]
K --> L

N["13. EventBridge (every 5-15 min)"] --> O["14. Lambda - recompute user weights"]
O --> M
O --> L

F["6. EventBridge"] --> G["7. Step Function"]
G --> H["8. Amazon SageMaker training job"]
H --> D

Here is also an example of the one that was displayed correctly:

flowchart LR
  U["Mobile App"] --> APIGW["API Gateway"]

  APIGW --> REC["Lambda: Recommendation API"]
  REC --> RDS["Aurora PostgreSQL<br/>(items, swipes, impressions, user_model_state)"]
  REC --> REDIS["ElastiCache Redis<br/>(optional cache)"]
  REC --> U

  APIGW --> INGEST["Lambda: Event Ingest<br/>(impression / swipe)"]
  INGEST --> RDS
  INGEST --> Q["SQS: recommendation-events"]

  Q --> AGG["Lambda: Aggregate Worker"]
  AGG --> RDS

  EB1["EventBridge<br/>(every 5-15 min)"] --> RECOMP["Lambda: Recompute User Weights"]
  RECOMP --> RDS

  EB2["EventBridge<br/>(nightly)"] --> SFN["Step Functions"]
  SFN --> TRAIN["SageMaker Training Job"]
  TRAIN --> COEF["Global Coefficients Store<br/>(SSM or DynamoDB)"]
  COEF --> REC

  Q --> DLQ["SQS DLQ"]
  DLQ --> CW["CloudWatch Alarm + SNS"]

  AGG --> CW
  RECOMP --> CW

Thanks, I'm able to repro the problem with that markdown.

This will be fixed in the next release.