On D10.3.x when tried to save form, I got 'allowed_html' is an unknown key because filters.filter_allowed.id is filter_allowed (see config schema type filter_settings.*).
'allowed_html' is an unknown key because filters.filter_allowed.id is filter_allowed (see config schema type filter_settings.*).
On 10.2.x works fine.
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We're getting the same error, and I can't see the difference for the fork you've opened here?
Escalating to critical since you can't use this at all nor edit anything else while it's enabled.