When you have dispensers set up in the formation below the first iteration of Redstone signal they receive they act normally. Any other signal they receive beyond that makes some of the dispensers not operate ( in this example only one did on the left) the dispensers then reset and operate ag after one signal input only if they had been updated (i.e.. by a nearby block being replaced)
I've tested this with both items and TNT in the dispenser and I expect it operates with other objects too. I took a picture with the F3 menu open incase that is needed to help replicate.
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This is caused by quasio connectivity. The first pulse shouldn't work, but it does for some reason, but all the others will not work.

Hi Blanket Duck,
I'm not sure what you mean that being quasi connectivity. The redstone above the grass blocks would power the grass blocks and therefore power the dispensers two. Quasi connectivity should be when a redstone component does not receive a direct signal.
I'm also not sure by what you mean when you say the first pulse shouldn't work since when I tested it in an up to date(1.16.4) world it does continue to work as intended.
Sorry if my initial post made any confusion I'll try and clear it up if possible.

Thank you for your report!
We're tracking this issue in MC-108, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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