The warning related to [warning] The "block_content:50c52459-c100-4e4d-92a4-9...

The warning related to [warning] The "block_content:50c52459-c100-4e4d-92a4-9c4c77d8f8d0" was not found
block_content not found is in know issue in CivicTheme.
The scenario
- The blocks are created during config import on theme install.
- Default site block are placed within the layout with predefined content.
- Block content at this point is not available, it is created only after the provision of content.

Block content cannot be created before the install of the block types.
After the provision of content blocks the blocks are correctly assigned.
These warning can be ignored

field_block Issue
- Needs more debugging.