Oh, I didn't realise that it was back in 2019, so that means the dead bees in the photo is a build up that's occurred over a years time. These bees have been dead like this for awhile now.
I'm surrounded by tens of thousands of people, so I'm not sure how I'll determine if someone sprayed poison, though even if I did conclude such I don't know what I can do about it, I can't exactly ask every household within a 5km radius because there would be thousands of them.