Oh wow that is strange – I downloaded a few of these new Canon cr3 files from dpreview, there were also 4 files taken with the R5 and while they were ok with ART 1.7, now that I’ve tried to open them again in 1.8.2 they also turn all purple like the example above from @peleme).
edit: I’ll also point out that the same issue appears on R6 raw files while EOS R and EOS RP (lucky me…) are ok.
@agriggio you can grab any of the cr3 from here: Canon EOS R5 sample gallery: from the mountains to the sound: Digital Photography Review
But anyway I’ll also put here one of these cr3 for your convenience:
012A0747.CR3 (54.1 MB)