unregister_tick_function: First-class callable syntax fails to unregister on PHP 8.5

[solverat]

Description

When using rector on one of our application, a closure registration changed from:

register_tick_function([$this, 'kick'])
unregister_tick_function([$this, 'kick']);

to

register_tick_function($this->kick(...));
unregister_tick_function($this->kick(...));

• Works on: PHP 8.4
• Fails on: PHP 8.5

Reproducable via this one: https://onlinephp.io/c/e6e79

The only internal change I found touching tick functions in 8.5 was php-src#18033, but that only moved the timing of php_deactivate_ticks() during shutdown and seems unrelated to this issue.

If this is intentional, it should be documented in the UPGRADING file.

PHP Version

PHP 8.5.6

Operating System

No response