The bug
If you place a bell at a location where should get powered, it doesn’t get powered until you update it. Iron doors and iron trapdoors had a simelar issue per MC-2298.
How to reproduce:
Place a redstone block
Open F3 screen
Place a bell next to it and look at it
❌ The bell is not powered and didn’t get rung. However if it receives a block update, it will update to powered state and will ring.
I can confirm