Error launching Spyder from Anaconda Navigator - "chcp 1252 ... 1>nul 2>nul"

I am using Anaconda to conduct data analysis in Python using Spyder. I've been doing so with no trouble for while now, installing packages, updating packages/Spyder/etc., but after updating Spyder, I now receive an error message when launching Spyder from within Anaconda.

C:\Users\jdoe>chcp 1252
Active code page: 1252

C:\Users\jdoe>call C:\Users\jdoe\Anaconda3\Scripts\activate C:\Users\jdoe\Anaconda3

(base) C:\Users\jdoe>spyder  1>nul 2>nul

This terminal window appears, then closes itself and Spyder along with it.

If I open a terminal window from within Anaconda and type spyder, I am able to launch the app successfully. But launching from Anaconda Navigator fails, and I don't understand this error message or how to fix it, nor have I been able to find anything relating to this issue in searching. Any help understanding what is going on and how to correct this would be appreciated.

conda info report if useful:

(base) C:\Users\jdoe>conda info

     active environment : base
    active env location : C:\Users\jdoe\Anaconda3
            shell level : 1
       user config file : C:\Users\jdoe\.condarc
 populated config files : C:\Users\jdoe\.condarc
          conda version : 4.10.1
    conda-build version : 3.18.11
         python version : 3.8.3.final.0
       virtual packages : __win=0=0
                          __archspec=1=x86_64
       base environment : C:\Users\jdoe\Anaconda3  (writable)
      conda av data dir : C:\Users\jdoe\Anaconda3\etc\conda
  conda av metadata url : https://repo.anaconda.com/pkgs/main
           channel URLs : https://repo.anaconda.com/pkgs/main/win-64
                          https://repo.anaconda.com/pkgs/main/noarch
                          https://repo.anaconda.com/pkgs/r/win-64
                          https://repo.anaconda.com/pkgs/r/noarch
                          https://repo.anaconda.com/pkgs/msys2/win-64
                          https://repo.anaconda.com/pkgs/msys2/noarch
          package cache : C:\Users\jdoe\Anaconda3\pkgs
                          C:\Users\jdoe\.conda\pkgs
                          C:\Users\jdoe\AppData\Local\conda\conda\pkgs
       envs directories : C:\Users\jdoe\Anaconda3\envs
                          C:\Users\jdoe\.conda\envs
                          C:\Users\jdoe\AppData\Local\conda\conda\envs
               platform : win-64
             user-agent : conda/4.10.1 requests/2.25.1 CPython/3.8.3 Windows/10 Windows/10.0.19041
          administrator : False
             netrc file : None
           offline mode : False