Missing config schema for view_mode stored in block

When using ctools entity_view (content) to place a view_mode in blocks, I get the following error warning message. The site works, but it always shows the warning:

Schema errors for block.block.mytheme_entityviewcontent_2 with the following errors: block.block.mytheme_entityviewcontent_2:settings.view_mode missing schema. These errors mean there is configuration that does not comply with its schema. This is not a fatal error, but it is recommended to fix these issues.

I'm using Drupal CMS v1.2 with a Radix 6.02 subtheme. Drupal 11.2

Updated IS, added MR and test coverage (the test fails correctly on D11 without the fix).
Adding also static patch for composer.