Operator v0.69.0 cannot reconclile VMAlertmanager

[TheDJVG]

I have a single VMAlertmanagerConfig that has a "telegram" receiver:

spec:
  receivers:
  - name: telegram.status                          
    telegram_configs:                                        
    - bot_token:                                      
        key: telegram.alerts                                   
        name: victoria-metrics-alertmanager-secrets   
      chat_id: -<redacted> (but it's a signed integer, a group, like -123456)       

Since upgrading my operator tor v0.69.0 it cannot reconcile the config with error:

Events:                                                                                                                                                                                         
  Type     Reason               Age        From                       Message
  ----     ------               ----       ----                       -------
  Warning  ReconciliationError  <unknown>  victoria-metrics-operator  incorrect result configuration, config source=: missing chat_id or chat_id_file on telegram_config                        
  Warning  ReconciliationError  <unknown>  victoria-metrics-operator  incorrect result configuration, config source=: missing chat_id or chat_id_file on telegram_config                        
  Warning  ReconciliationError  <unknown>  victoria-metrics-operator  incorrect result configuration, config source=: missing chat_id or chat_id_file on telegram_config                        
  Warning  ReconciliationError  <unknown>  victoria-metrics-operator  incorrect result configuration, config source=: missing chat_id or chat_id_file on telegram_config                        
  Warning  ReconciliationError  <unknown>  victoria-metrics-operator  incorrect result configuration, config source=: missing chat_id or chat_id_file on telegram_config

This is my VMAlertmanager spec:

spec:
  configSecret: ""
  disableNamespaceMatcher: true
  externalURL: <redacted>
  image:
    tag: v0.32.0
  port: "9093"
  replicaCount: 1
  routePrefix: /
  selectAllByDefault: true
  templates:
  - key: monzo.tmpl
    name: vmalertmanager-victoria-metrics-monzo-tpl

Reverting the operator to v0.68.1 restores functionality. It's still possible it's a configuration error on my side but I can't figure out why that would be. The VMAlertmanagerConfig object passes validation just fine.