Php opcache.enablecli setting and Bake shell

I’m doing localdev under Windows 10 / XAMPP. To speed up some other cli work I do, I had enabled the Zend opcode cache in my php.ini:

; Determines if Zend OPCache is enabled for the CLI version of PHP

Having done this, the bake shell runs exactly once, and is then no longer available. ie:

> bin\cake

Welcome to CakePHP v3.3.3 Console
App : src
Path: E:\Projects\websites\dam2\site\src\
PHP : 5.6.19
Current Paths:

* app:  src
* root: E:\Projects\websites\dam2\site
* core: E:\Projects\websites\dam2\site\vendor\cakephp\cakephp

Available Shells:

[Alt3/Swagger] swagger

[DebugKit] benchmark, whitespace

[Migrations] migrations

[CORE] cache, i18n, orm_cache, plugin, routes, server

[app] console

Purging the opcode cache manually allows the command to work once only.
Reverting the opcache.enablecli setting in the php.ini and the shell is callable again.

Not a big deal, but any idea what makes the Bake shell incompatible with the opcache?