Json error when activate Route 66

 Hi Lefteris, how are you?
I'm trying Route 66 in a Joomla 4.2.8 multilingual site.
When I activate the Route 66 URL, I have the following error

Warning: json_decode() expects parameter 1 to be string, object given in
/mysitepath/joomla/templates/wimble/error.php
on line
51

Page not found

Call stack
# Function Location
1 () JROOT/libraries/src/Router/Router.php:153
2 Joomla\CMS\Router\Router->parse() JROOT/libraries/src/Application/SiteApplication.php:736
3 Joomla\CMS\Application\SiteApplication->route() JROOT/libraries/src/Application/SiteApplication.php:224
4 Joomla\CMS\Application\SiteApplication->doExecute() JROOT/libraries/src/Application/CMSApplication.php:294
5 Joomla\CMS\Application\CMSApplication->execute() JROOT/includes/app.php:61
6 require_once() JROOT/index.php:32

Thanks for your support

Hi Lefteris! How are you?
The multilingual status is ok

https://drive.google.com/file/d/1BpF4P19Da7CjoTpocFJQ0h1Zx3WMSk6w/view?usp=share_link

Steps to recreate the issue
Select a menu category blog
Select one of the articles
The url is formatted as I want (only domain/{articleAlias}
But displays error

If I deactivate Route 66, the url has category/subcategory/articlealias, and displays ok

I let you a screen record
https://drive.google.com/file/d/1cmal7fQby1x--g7Dbpet37PW4zcCbJ1H/view?usp=share_link

Also, I've tried with Casiopeia template, to discard template issues. I have the same result

https://drive.google.com/file/d/1u6cFGAvl1CyLphNAlZN03BLqi30LwTr7/view?usp=share_link

Best regards