After I accepted a phone call without saving the game, all the textures got scrambled and changed into Nether-like ones.

After I answered a phone call and then returned to the game, it automatically paused. Then I noticed that all textures not related to blocks, but to smaller items (such as fire on campfires or water), were either replaced with Nether textures or disappeared completely. When I entered the Nether and received another call, all textures also changed to warped/crimson forest tree textures