Ensure you are adding the Tile Imagery Layer (see below screenshot)
Esri 2020 Land Cover - Overview (arcgis.com)
You could check another workaround.
1. Add Data > Data From Path
2. Use the following URL > Add
https://tiledimageservices.arcgis.com/P3ePLMYs2RVChkJx/arcgis/rest/services/Esri_2020_Land_Cover_V2/ImageServer
Clear cache, if required.
Share a few screenshots, if the issue still persists.
Think Location