suggestion throws an error when triggered on specific text[Bug]

Reproducible in vscode.dev or in VS Code Desktop?

• Not reproducible in vscode.dev or VS Code Desktop

Reproducible in the monaco editor playground?

• Not reproducible in the monaco editor playground

Monaco Editor Playground Code

case

Reproduction Steps

input text "case"
trigger suggestion

Actual (Problematic) Behavior

error is thrown in console:

errors.ts:26 Uncaught Error: Debug Failure. Invalid cast. The supplied value [object Object] did not pass the test 'Mo'.

Error: Debug Failure. Invalid cast. The supplied value [object Object] did not pass the test 'Mo'.
at Object.Rn [as cast] (tsWorker.js:9:21239)
at Be (tsWorker.js:247:49873)
at _e (tsWorker.js:247:54111)
at Object.L [as getCompletionsAtPosition] (tsWorker.js:247:30870)
at Object.a [as getCompletionsAtPosition] (tsWorker.js:255:14077)
at lm.getCompletionsAtPosition (tsWorker.js:33955:3086)
at S.fmr (workerMain.js:22:33695)
at f._handleMessage (workerMain.js:22:17684)
at Object.handleMessage (workerMain.js:22:17309)
at w._handleRequestMessage (workerMain.js:22:14120)
at errors.ts:26:12

Expected Behavior

No uncaught error in console

Additional Context

No response

Reproduce the issue in the Monaco Editor Playground with the text "case" and trigger suggestions. Start at getCompletionsAtPosition in tsWorker.js, then follow the reported path through workerMain.js and errors.ts. Done means the reproduction no longer produces an uncaught console error.