Hi Alexander. Sorry - must be very frustrating. You're getting the messages because you originally reported the issue. Best I can suggest is this:
Log in to the site
In the top right corner, click your avatar and choose Profile
Click the Edit button (pencil icon) next to Preferences
Change Autowatch from "Inherit Global Settings" to "Disabled"
Click Update
This will stop you from automatically getting updates from this issue, any others you've created, and any you've commented on. You'd need specifically to choose to watch any issues you did want to get email updates for.
Also having this issue. Conduit is underwater. Frame has been removed. Trying to mine using Diamond pickaxe with Efficiency V, Unbreaking III, Silk Touch and Mending. No breaking animation and item does not break. Minecraft 1.13.2 multiplayer.
Confirmed @Jack's finding that there is now a breaking animation in 19w39a. Timed it at 19 seconds to break using an Efficiency V diamond pickaxe.
This is a long time, but so long as you have the conduit frame in place, you shouldn't need potions etc. If necessary, there are solutions to create an air pocket you could stand in.
This seems acceptable to me, and certainly better than when the bug was first reported and my experience was that the conduit wouldn't break at all.