Landscape Editor Selection Mask Tool is broken on 5.4

Development World Creation
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1

Hi, this is how Selection/Mask tool looks on 5.4:

SelectionMask
SelectionMask1312×608 109 KB

I found that the DataTexture used for this has incorrect pixel format (4bpp instead of expected 1bpp which was the case in 5.3 when it was still ok). This format seems to come from DDC but even when I clear it / force rebuild, it still looks wrong.

Furthermore: Calling UpdateResource() on it fixes it. It triggers on map save on Texture2D::PreSave.

  1. How to fix it, I need it functional ASAP (it’s blocking a long overdue project migration)?
  2. Please fix it in 5.5 (ue5-main still has this issue - checked yesterday).