Globe flickering when creating labels

[AndresPozo]

In Cesium v1.125, when creating labels, the globe briefly disappears and reappears, causing a black flickering.
I have created a very simple test in Sandcastle that demonstrates this effect:
https://sandcastle.cesium.com/#c=dVFBTsMwEPzKKpcmUuWkghNNKyAcK3FoxSkX19kUC8eO7E1KQfwdJ05RBeWy9o5nZsdaYbQj6CUe0cIKNB6hQCe7hr2MWFxGYuwLo4lLjbaMkmWpS62QQPE9KjfoOqVGdMt1JbgjhYxX1c4Ytef2sSMy2lvt0FEZzaHutCBpNMQJfJYaQNYQB7MJgCkTcwI1stbKRpLs0TGLjenxzF4O5K+h/GT5T+jzxBf/2wz8wiiFY5Q4CV7BZiRPQVrj5Bj27iwtuCV/4/qG1dY0T3iwiC7O5nCbMV8XWebPZB70hO/ktbOH4D0bEw/DfInmUe7opHAduAD3smmNJeisihlLCZtWcT8t3XfiDYkJN30aIE8vpXkle5DV6srCQCjunH+p/Zq28gPLaJ2nnv9HqgyvpD4892gVPw2018V6E0DGWJ769rqSwqp/OX8D
Pressing the Test button destroys and creates a label. The label does not flicker, but the globe does.
This did not happen in Cesium v1.108.

I am testing on the latest version of Chrome on different Windows machines with different graphics cards and it fails on all of them.
It also fails when using the entity API.

In this second example, you can see that the problem occurs when the first label is added to a LabelCollection:
https://sandcastle.cesium.com/#c=jVLLTsMwEPyVJeKQQHEawYmmFVCOSEiAOOWAm2xbC8eO7E14VP137DjljcQhiXc9MzsZu9TKEnQCn9DAFBQ+wRytaGt23/fiIir7eq4VcaHQFFEyKVShJBJIvkBpPa+Vsu/eclWV3JJExqvqTmu54OaiJdLKSZ1XVeAU0QiWrSpJaAVxAptCAYglxHtBMvE1fOgHg8yWqJA1RtSCRIfWz4g/eb7y+LmWEnvlOPFWAfwTpHrCJog32op+/umOPueG3IqrY7Y0ur7ElUG08dHAlahWtIYDyMYjOBkz987GY/dNRkGR8Jmc2kNvY3/zhXaYbR88austbZN/hHWDFunPoIachn/5Kx+Dte5wB558S3U4NWeqtxSNotzSi8RZwAGcibrRhqA1MmYsJawbyV1E6aItH5FYad9F8/QzNa9EB6Ka/nJ7oJTcWrezdNNvxSsW0SxPHf4HVWpeCbW67tBI/uJh62x2FZqMsTx15e9MClF+U34D
Press the "Add Label" button to add labels and the "Reset" button to clear the label collection.
It only flickers when adding the first label.