I have updated Hypervisor to version 8.1. When making a snapshot with Xen-Orchestra (or backup) I have the following error:

vm.snapshot
{
  "id": "52c6fa55-04ca-e49b-b062-49672cd22d42"
}
{
  "code": "MESSAGE_REMOVED",
  "params": [],
  "call": {
    "method": "Async.VM.snapshot_with_quiesce",
    "params": [
      "OpaqueRef:31132347-1336-48cf-95b4-1409c888af86",
      "VM052 [Quorum Alpha]_2020-01-13T08:47:42.746Z"
    ]
  },
  "message": "MESSAGE_REMOVED()",
  "name": "XapiError",
  "stack": "XapiError: MESSAGE_REMOVED()
    at Function.wrap (/opt/xen-orchestra/packages/xen-api/src/_XapiError.js:16:12)
    at _httpRequestPlus.default.post.readAll.then.text (/opt/xen-orchestra/packages/xen-api/src/transports/json-rpc.js:35:27)
    at tryCatcher (/opt/xen-orchestra/node_modules/bluebird/js/release/util.js:16:23)
    at Promise._settlePromiseFromHandler (/opt/xen-orchestra/node_modules/bluebird/js/release/promise.js:547:31)
    at Promise._settlePromise (/opt/xen-orchestra/node_modules/bluebird/js/release/promise.js:604:18)
    at Promise._settlePromise0 (/opt/xen-orchestra/node_modules/bluebird/js/release/promise.js:649:10)
    at Promise._settlePromises (/opt/xen-orchestra/node_modules/bluebird/js/release/promise.js:729:18)
    at _drainQueueStep (/opt/xen-orchestra/node_modules/bluebird/js/release/async.js:93:12)
    at _drainQueue (/opt/xen-orchestra/node_modules/bluebird/js/release/async.js:86:9)
    at Async._drainQueues (/opt/xen-orchestra/node_modules/bluebird/js/release/async.js:102:5)
    at Immediate.Async.drainQueues (/opt/xen-orchestra/node_modules/bluebird/js/release/async.js:15:14)
    at runCallback (timers.js:810:20)
    at tryOnImmediate (timers.js:768:5)
    at processImmediate [as _immediateCallback] (timers.js:745:5)"
} 

Citrix removed something from xapi? Snapshots with memory works OK. I'm using Xen-Orchestra 5.54.0 from sources (compiled today for tests).