bug?: mb_strlen() - version 2 /joomla 4.0.3

Hello
I reread the documentation.
Module and plugin activated from the latest version 2.0 / joomla 4.0.3 / Helix Ultimate
I have 2 articles with a custom fields checkbox

a/ Module:
I moved the module to different places by putting only the filter on the home page - only for articles, without changing other settings

b/ Custom fields checkboxes:
View in the filter: checkboxes
Individual layout: checkboxes
no other settings changed

I have the error message :
mb_strlen(): Argument #1 ($string) must be of type string, array given
Please help me
Regards

Hi,
I have the same mistake with Cassiopeia!
Thanks for your feedback
Regards

Hi,
I found, I had a php 8. By going back to php 7.4 it works
Can you indicate it in the requirements? or accept version 8.x ?
Regards