I have found 4 more broken texture samples these are part of my landscape master which I have not used for months the only sample that still works is the soil that is always on the ground.
Also got more png read errors:
The four broken textures were fine when I downloaded them at the back end of last year no idea when these broke or how.
I did update my engine from 5.3.2 to 5.5.4 back in February could updating the engine break these textures?
New warning from ouput log (no idea what it means)
LogTexture: Warning: GetMipData failed for /Game/Fab/Megascans/Surfaces/Uncut_Grass_pjwid0/Medium/T_pjwid0_2K_B.T_pjwid0_2K_B (DXT1)
Just incase I broke something unknowingly this is what my master looks like. (All of my masters are the same for each new megascan I add to my project)