WebP uploads doesn't work properly anymore

For quite a while, I’ve had a photo workflow that converts images to WebP (both to reduce size, and so that I don’t have to separate between jpeg and png, for transparency). However, when I got back to blogging last month, I noticed an issue with new WebP images…

Micro.blog does something to them now that makes them very grey and dull!

Below you can see a WebP image before and after I’ve uploaded it to Micro.blog… :backhand_index_pointing_down:t2:

Any ideas??

Looks to me like the color gamut is getting stripped.