Can confirm in release 1.18. Would also like to make the following notes:
(Screenshots 16.16.37, 16.16.45): The redstone wire can be updated but only in certain ways. For example, this setup does not destroy the redstone, but removing the torch or repeater does. Note that placement order does matter; the redstone wire must be placed first. Subsequent ordering of the other two components is not important.
(Screenshot 16.21.38): This still applies with waterlogged trapdoors, and also applies to any kind of trapdoor.
(Screenshot 16.13.22): Updating the trapdoor does not remove the redstone wire even with power.
(Screenshots 16.14.32, 16.15.26): While in many cases removing the torch from the system (see note 1 above) will cause the redstone wire to break, this setup does not. See details below.
(Screenshot 16.29.50): The issue is independent of orientation, as long as [half=top].
(Screenshots 16.58.31, 16.58.36, 17.01.46): Using /setblock the trapdoors can be modified. What may be worthy of note is that some instances of /setblock will break the wire and some will not. Initially, let the right trapdoor be attributed [facing=south,half=top,open=false,powered=false,waterlogged=false]. When using /setblock to change the corresponding attributes to [facing=east,open=false] (first screenshot). This does not break the redstone wire. When attributing [facing=south,open=true] after the first command, it breaks both wires (second screenshot). When doing this independently of the first command, it breaks only the wire above the modified trapdoor (third screenshot).
(No screenshots): This is confirmed to work in singleplayer and multiplayer.
Alexander Ram
Can confirm in release 1.18. Would also like to make the following notes:
(Screenshots 16.16.37, 16.16.45): The redstone wire can be updated but only in certain ways. For example, this setup does not destroy the redstone, but removing the torch or repeater does. Note that placement order does matter; the redstone wire must be placed first. Subsequent ordering of the other two components is not important.
(Screenshot 16.21.38): This still applies with waterlogged trapdoors, and also applies to any kind of trapdoor.
(Screenshot 16.13.22): Updating the trapdoor does not remove the redstone wire even with power.
(Screenshots 16.14.32, 16.15.26): While in many cases removing the torch from the system (see note 1 above) will cause the redstone wire to break, this setup does not. See details below.
(Screenshot 16.29.50): The issue is independent of orientation, as long as [half=top].
(Screenshots 16.58.31, 16.58.36, 17.01.46): Using /setblock the trapdoors can be modified. What may be worthy of note is that some instances of /setblock will break the wire and some will not. Initially, let the right trapdoor be attributed [facing=south,half=top,open=false,powered=false,waterlogged=false]. When using /setblock to change the corresponding attributes to [facing=east,open=false] (first screenshot). This does not break the redstone wire. When attributing [facing=south,open=true] after the first command, it breaks both wires (second screenshot). When doing this independently of the first command, it breaks only the wire above the modified trapdoor (third screenshot).
(No screenshots): This is confirmed to work in singleplayer and multiplayer.