xtightvncviewer: "Rect too large" after connecting to Mac

[rduke15]

Connecting from Ubuntu 20.04.2 to MacOS 10.15.7 shows the initial login screen, but immediately exits after login, before showing the desktop.

The error is "Rect too large: 1922x1080 at (0, 0)"

The full command and output is:

  $ vncviewer myhost.example
  Connected to RFB server, using protocol version 3.8
  Performing standard VNC authentication
  Password:
  Authentication successful
  Desktop name "myhost"
  VNC server default format:
    32 bits per pixel.
    Least significant byte first in each pixel.
    True colour: max red 255 green 255 blue 255, shift red 16 green 8 blue 0
  Warning: Cannot convert string "-*-helvetica-bold-r-*-*-16-*-*-*-*-*-*-*" to type FontStruct
  Using default colormap which is TrueColor. Pixel format:
    32 bits per pixel.
    Least significant byte first in each pixel.
    True colour: max red 255 green 255 blue 255, shift red 16 green 8 blue 0
  Rect too large: 1922x1080 at (0, 0)

  $ apt-cache policy xtightvncviewer
  xtightvncviewer:
    Installed: 1.3.10-0ubuntu5

(Note that launchpad doesn't let me assign this bug to "xtightvncviewer", saying that package doesn't exist. It says the binary is in the "tightvnc" package. But my Ubuntu 20.04.2 has no such package, but does have "xtightvncviewer". I guess that's some different bug in launchpad itself?)