Yes, interesting. Traces of it should be in the Tracker. If it has been removed, even by mistake, say via 'Inappropriate' there will be no trace. However if you search the Web for (precisely) "unknown-plant-the-one-with-the-cell-like-leafs" (in quotes) then one entry comes but is inconclusive (and annoying!). If you then switch to Images (search Google Images say) you get THIS (forum) entry only, so yes it is suffering from a breakdown. In the microsecond before producing the 404 error, something is revealed so it has caught a cold but it just may be hiding...
Searching iSpot for 760577 (the post number) suggests it's 'gone'
760576 is 6 May 2018
760578 is 6 May 2018
You did not create an Observation 6 May - your forum Item is 6 May