IDE hangs on startup: "TypeError: Cannot read properties of undefined (reading 'split')"

Development Tools IDE 2.x
1

I just installed 2.1.1 and tried to launch. I can see it running 3 processes in Task manager, but nothing else.

PowerShell shows this:

PS C:\Program Files\Arduino IDE> & ".\Arduino IDE"
PS C:\Program Files\Arduino IDE>
Arduino IDE 2.1.1
Starting backend process. PID: 2588
C:\Program Files\Arduino IDE\resources\app\node_modules\toidentifier\index.js:26
    .split(' ')
     ^

TypeError: Cannot read properties of undefined (reading 'split')
    at toIdentifier (C:\Program Files\Arduino IDE\resources\app\node_modules\toidentifier\index.js:26:6)
    at forEachCode (C:\Program Files\Arduino IDE\resources\app\node_modules\send\node_modules\http-errors\index.js:245:16)
    at Array.forEach (<anonymous>)
    at populateConstructorExports (C:\Program Files\Arduino IDE\resources\app\node_modules\send\node_modules\http-errors\index.js:243:9)
    at Object.<anonymous> (C:\Program Files\Arduino IDE\resources\app\node_modules\send\node_modules\http-errors\index.js:30:1)
    at Module._compile (node:internal/modules/cjs/loader:1110:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1140:10)
    at Module.load (node:internal/modules/cjs/loader:982:32)
    at Module._load (node:internal/modules/cjs/loader:823:12)
    at Function.c._load (node:electron/js2c/asar_bundle:5:13331)
[25556:0825/073522.782:ERROR:gpu_init.cc(453)] Passthrough is not supported, GL is disabled, ANGLE is
2

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