Button with "IO Command" does not take the sleep(<float>) command

[bigl00z3]

Describe the bug
A clear and concise description of what the bug is.

I am trying to set a visual alarm by flashing a LED (several times in a row to have it more visible)
I send a command to a Phidget 1019 by calling a button which is using the "IO Command":

The button's IO command is:
pulse(0,1000,595251);sleep(1);pulse(1,1000,595251);sleep(3);pulse(2,1000,595251)

For the test, I have set it to 3 different LEDs on different Phidgets output ports to allow to see if they all flash at the same time or if they do it in a sequence. For the test

Result: they all flash at the same time once for 1000ms
--> the sleep function does not seem to work.

This is confirmed by the "Message History" where I get the error "No match for command [sleep], continuing"

Based on the Button's help menu, I would expect it to be feasible as under IO Command:

_ IO Command Help sleep() sleep: add a delay of seconds_

Setup (please complete the following information):

• Artisan Version [e.g. v2.4.4]: 2.4.5
• Artisan Build (number in brackets shown in the about box) [e.g. 97e6dec]:
• Version [e.g. 22]:
• Platform (Mac/Windows/Linux + OS version) [e.g. macOS 10.15.3]:
• Connected devices or roasting machine [e.g. Probatone 5]:

Additional context
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[MAKOMO]

IO Command sleep() is broken and maybe always was. A simple typo.