Java: RESOURCE_MODIFIED in updateFormFields

Hi folks,

I am using the Java SDK for years now, it was working and I didn’t change anything on my site. Now (since about 2 weeks or more) I have the following problem:
After creating an Agreement and setting it to state AUTHORING I want to update the form fields. The relevant part in my code including debugging additions is this:

try {
	agreementsApi.updateFormFields(authorization, etag, id, formFieldPutInfo, xApiUser, xOnBehalfOfUser);
} catch (Exception e) {
	agreementInfoHTTP = agreementsApi.getAgreementInfoWithHttpInfo(authorization, id, xApiUser, xOnBehalfOfUser, ifNoneMatch);
	etag = agreementInfoHTTP.getHeaders().get("etag").get(0);

	System.out.println("etag: " + etag);

	throw(e);
}

However this now leads to an ‘io.swagger.client.model.ApiException: Precondition Failed’ and returns ‘{"code":"RESOURCE_MODIFIED","message":"Resource is already modified with newer version"}’.

When using the GET /agreements/{agreementId} here with authorization and agreement id I get the exact same ETag in the Header as I get from my Java Code. The result body is:

{
  "id": "CBJ...",
  "name": "...",
  "groupId": "CBJ...",
  "type": "AGREEMENT",
  "workflowId": "CBJ...",
  "message": "...",
  "participantSetsInfo": [
    {
      "id": "CBJ...",
      "memberInfos": [
        {
          "email": "...",
          "deliverableEmail": true,
          "name": "...",
          "id": "CBJ...",
          "securityOption": {
            "authenticationMethod": "NONE",
            "identityCheckInfo": {}
          },
          "status": "ACTIVE",
          "extendedStatus": "ACTIVE"
        }
      ],
      "role": "SIGNER",
      "order": 1,
      "label": "Signer"
    }
  ],
  "senderEmail": "...",
  "createdDate": "2026-03-24T09:52:02Z",
  "lastEventDate": "2026-03-24T09:52:05Z",
  "signatureType": "ESIGN",
  "ccs": [
    {
      "email": "...",
      "label": "Cc"
    }
  ],
  "locale": "de_DE",
  "status": "AUTHORING",
  "documentVisibilityEnabled": false,
  "hasFormFieldData": false,
  "hasSignerIdentityReport": false,
  "agreementSettingsInfo": {
    "canEditFiles": false,
    "canEditElectronicSeals": false,
    "canEditAgreementSettings": false,
    "showAgreementReminderSentEvents": false,
    "hipaaEnabled": false,
    "showDocumentsViewedEvents": false
  },
  "sendType": "REGULAR_SEND",
  "senderSigns": "NEVER",
  "createdGroupId": "CBJ...",
  "documentRetentionApplied": false
}

What can I do?