cesium: Bear glTF 2.0 model is not displayed in Cesium.js v1.40 or later

I tried to display the bear glTF model that was in sketchfab with the latest version of Cesium.js. https://sketchfab.com/models/f2f13a8630004b1c82730d8b9ffa0e1f

However, in Cesium.js v1.40 and later, an error is displayed and it seems that it is not displayed correctly.

Cesium.js v1.39 + Bear glTF model result:

Cesium.js v1.44 + Bear glTF model result:

Cesium.js:532 
An error occurred while rendering.  Rendering has stopped.
undefined
TypeError: i.clampTime is not a function
TypeError: i.clampTime is not a function
    at Array.<anonymous> (https://cdn.rawgit.com/cx20/gltf-test/279cba56/libs/cesium/1.44/Cesium.js:497:22244)
    at h (https://cdn.rawgit.com/cx20/gltf-test/279cba56/libs/cesium/1.44/Cesium.js:496:19348)
    at c.update (https://cdn.rawgit.com/cx20/gltf-test/279cba56/libs/cesium/1.44/Cesium.js:496:21384)
    at Ae.update (https://cdn.rawgit.com/cx20/gltf-test/279cba56/libs/cesium/1.44/Cesium.js:498:20408)
    at a.update (https://cdn.rawgit.com/cx20/gltf-test/279cba56/libs/cesium/1.44/Cesium.js:492:8011)
    at tt (https://cdn.rawgit.com/cx20/gltf-test/279cba56/libs/cesium/1.44/Cesium.js:525:21935)
    at Ke (https://cdn.rawgit.com/cx20/gltf-test/279cba56/libs/cesium/1.44/Cesium.js:525:19739)
    at Qe (https://cdn.rawgit.com/cx20/gltf-test/279cba56/libs/cesium/1.44/Cesium.js:525:17745)
    at lt (https://cdn.rawgit.com/cx20/gltf-test/279cba56/libs/cesium/1.44/Cesium.js:525:25765)
    at ut (https://cdn.rawgit.com/cx20/gltf-test/279cba56/libs/cesium/1.44/Cesium.js:525:25933)