Reproduction steps:
1. Create a new project
2. Create any Standard Element (e.g. GameObject > UI Toolkit > Standard Elements > Label) and save UXML file
3. Select the Standard Element in the Hierarchy and add any Backdrop Filter in the Inspector
4. Zoom in in the UI Viewport
5. Observe the Console and the Editor windows

Actual result: "RenderTexture.Create failed: requested size (47548, 1995) is too large for the current maxRenderTextureSize(16384)." errors are thrown continuously and the Editor windows flicker black
Expected result: No errors are thrown and the Editor windows render normally

Reproducible with: 6000.6.0b1, 6000.6.0b9, 6000.7.0a5
Couldn’t reproduce with: 6000.0.82f1, 6000.3.22f1, 6000.5.9f1, 6000.6.0a7 (No Backdrop Filter section)

Reproduced on: Ubuntu 24.04, macOS Tahoe 26.5 (M4)

Notes:

Issue is also reproducible in UI Builder
Zooming out solves the issue
Full error:

RenderTexture.Create failed: requested size (189591, 11746) is too large for the current maxRenderTextureSize(16384).
UnityEngine.UIElements.BaseRuntimePanel:Render ()
Unity.UIToolkit.Editor.PanelElement/RuntimePanel:Render ()
Unity.UIToolkit.Editor.PanelElement:FrameUpdate ()
Unity.UIToolkit.Editor.UICanvas:ForceRuntimePanelUpdate (UnityEngine.UIElements.Panel)
UnityEditor.RetainedMode:UpdateSchedulers ()