The on_timeline_start function does not run at the start of every repetition

[ChangrunHuang]

Hi I am coding an online experiment. During debugging I notice that the on_timeline_start function only runs once within a timeline node while the the repetition was indicated more than 1. This does not comply with the documentation in the website

The on_timeline_start callback can be declared in a timeline node. The callback will be triggered when the timeline starts during the experiment, including when timeline_variables, loop_function, or sample options are used. If a conditional_function is used, then the conditional function will execute first, and the on_timeline_start function will only execute if the conditional function returns true. If the repetitions option is used, this function will be triggered at the start of every repetition.

the code:

the test: only trigger once