"Texture is not accessible" GUIUtility error using textures from asset bundles

Unity Engine
1

Hello everyone,
I’m noticing some strange behavior with some cubemaps that I download via asset bundles.
This is the situation:
I have two asset bundles, the first one contains a Unity scene within which there is a custom reflection probe. The second one contains a cubemap used by the previous reflection probe.
When I’m in play mode in that scene, if I select the reflection probe object in Hierarchy, the console logs the following errors multiple times:

UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)

Can't read from cubemap
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)```

In the game, however, the reflection probe seems to work correctly and it refers to the correct cubemap and these errors do not block the application in any way. I don't understand if I triggered them or if it's some editor bug.
Have any of you encountered the same problem?

EDIT: I encountered these errors on both windows and macOS and on Unity I mainly use the Android platform. 
If I don't select the reflection probe the errors do not appear in the console (in the editor) as they do not appear at all in the builds I try on my phone (in the application there is a debug console which shows the same logs as the editor console).
2

I’ve got this error when build player and game icon texture is not marked as read/write in import settings.

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