Clank when starting to pedal

Recently I noticed that my bike makes a loud clanking sound when I start pedalling, both from a stand still and after freewheeling. I I remember correctly the problem started after I washed the bike, so my first thought was that some of the degreaser got into some bearings. But given that the LBS has re-greased everything down to the threads of the through axles that option is less likely.

I should also stress that there is just one clank after I start pedalling, which makes me think something is settling in to place, as for what it might be, I have no Idea. It also doesn’t mater how much pressure I put on the pedals. I do feel a slight click on the non-drive-side along with the clank, but that could also just be my imagination. I haven’t been able to recreate the symptoms when the bike was in the bike stand. The bike is a giant propel 2020 model.

Does anyone have an idea what this might be?

Looking forward to your input