Does this issue occur when all extensions are disabled?: Yes/No
Yes

• VS Code Version: 1.72.2 (user setup)
• OS Version: Windows_NT x64 10.0.22000

Steps to Reproduce:

1. build and install the extension of https://github.com/microsoft/vscode-extension-samples/tree/main/custom-editor-sample
2. close all running vscode (important!)
3. open file with command: code test.pawdraw
4. the custom editor won't activate, it shows the text editor instead
5. keep the vscode open, and open the same file again: code test.pawdraw
6. this time, the custom editor is activated