Can confirm that I've had the same issue. However you don't need to die in the Nether, you just need to have a depleted respawn anchor in the Nether. Dying in the Overworld under these conditions will yield the same glitch.
Also of note that these Nether ghost blocks can be broken, causing the corresponding blocks in the Nether become broken (and yield their drops once you return to the Nether). Right clicking blocks or placing blocks also causes ghost blocks to return to normal until hit again. In general left-click actions appear to interact with the Nether and right-click actions interact with the Overworld.
This glitched state can also be exited by either relogging, dying, or travelling to another dimension. Relogging and dying both returning you to the Overworld as you'd expect.
Sigmath Bits
Can confirm that I've had the same issue. However you don't need to die in the Nether, you just need to have a depleted respawn anchor in the Nether. Dying in the Overworld under these conditions will yield the same glitch.
Also of note that these Nether ghost blocks can be broken, causing the corresponding blocks in the Nether become broken (and yield their drops once you return to the Nether). Right clicking blocks or placing blocks also causes ghost blocks to return to normal until hit again. In general left-click actions appear to interact with the Nether and right-click actions interact with the Overworld.
This glitched state can also be exited by either relogging, dying, or travelling to another dimension. Relogging and dying both returning you to the Overworld as you'd expect.