Python Environments Extentions prevents load of CSolution Extension

[MatthiasHertelArm]

Type: Bug Report

Describe the bug

• OS and Version: MacOS Tahoe 26.2
• VS Code Version:

Version: 1.108.0 (Universal)
Commit: 94e8ae2b28cb5cc932b86e1070569c4463565c37
Date: 2026-01-08T13:53:10.781Z
Electron: 39.2.7
ElectronBuildId: 12953945
Chromium: 142.0.7444.235
Node.js: 22.21.1
V8: 14.2.231.21-electron.0
OS: Darwin arm64 25.2.0

• Extension Version: 1.64.2
• Target Device: -
• Other extensions you installed (and if the issue persists after disabling them):
  ms-python.vscode-python-envs 1.16.0 (disabling fixes the issue)

With successfully activated Python Environments extension, the load of Csolution extension fails with an Error:

console.ts:139 [Extension Host] stack trace: TypeError: Cannot read properties of undefined (reading 'onDidChangeEnvironment')
	at m.activatePythonEnvApi (/Users/mather01/.vscode/extensions/arm.cmsis-csolution-1.64.2-darwin-arm64/dist/extension.js:2:1583148)
	at m.activate (/Users/mather01/.vscode/extensions/arm.cmsis-csolution-1.64.2-darwin-arm64/dist/extension.js:2:1582257)
	at Object.activate (/Users/mather01/.vscode/extensions/arm.cmsis-csolution-1.64.2-darwin-arm64/dist/extension.js:2:1583756)
	at /Users/mather01/.vscode/extensions/arm.cmsis-csolution-1.64.2-darwin-arm64/dist/extension.js:174:24438
	at /Users/mather01/.vscode/extensions/arm.cmsis-csolution-1.64.2-darwin-arm64/dist/extension.js:2:1135351
	at /Users/mather01/.vscode/extensions/arm.cmsis-csolution-1.64.2-darwin-arm64/dist/extension.js:2:1887377
	at Generator.next (<anonymous>)
	at /Users/mather01/.vscode/extensions/arm.cmsis-csolution-1.64.2-darwin-arm64/dist/extension.js:2:1884982
	at new Promise (<anonymous>)
	at o (/Users/mather01/.vscode/extensions/arm.cmsis-csolution-1.64.2-darwin-arm64/dist/extension.js:2:1884730)
	at t.measureRun (/Users/mather01/.vscode/extensions/arm.cmsis-csolution-1.64.2-darwin-arm64/dist/extension.js:2:1887280)
	at /Users/mather01/.vscode/extensions/arm.cmsis-csolution-1.64.2-darwin-arm64/dist/extension.js:2:1135346
	at Generator.next (<anonymous>)
	at s (/Users/mather01/.vscode/extensions/arm.cmsis-csolution-1.64.2-darwin-arm64/dist/extension.js:2:1134793)