I definitely believe it is a bug that I’ve been dealing with for months since it won’t allow you to view pdfs in the browser. The workaround that I’ve been using has been to use custom JavaScript to call the supabase plugin to get the correct public URL (Displaying an image from Supabase - #12 by Broberto).
const { data } = await wwLib.wwPlugins.supabase.instance
.storage
.from('<bucket-name>')
.getPublicUrl('folder/avatar1.png')
return data
The URL return from this matches what you see if you manually get it inside supabase.
I honestly might just continue doing this as so far is covers all files types (and I don’t use the transform or download link that often anyways), but it would be nice for them to fix this issue with the plugin.