I worked around this by opening beehaw in another tab and searching for the community/user/post i wanted to interact with. Copying the whole handle (as in your example) into the lemmy.ml’s seachbar showed the desired content on lemmy.ml’s instance.
Another workaround I’m using is abusing the ‘These posts might be related’ query to seach for keywords :D That’s how I found this post; I wanted to create a new one called ‘lemmy and fediverse instances’.
So, hoping there is no API policy change in Andromeda?