The possibility of obtaining the Grail artifact has become different for each difficulty level. Significantly.
And some minor things have been added.
I got really tired of the game lagging when capturing the Grail. There's no way to lure it. As a result, I had to seriously change the concept.
And there was a small oversight (not a bug) in 3.4 and earlier, where with some persistence, you could collect a whole bucket of Grails. I accidentally found this myself. But it seems no one noticed it.
PS. All workarounds were removed in 3.4.