Some blocks didn't show their data in the backend since the Meta Box update 5.10.5. Removing Divider-Fields in the Fields section of the block's Custom Field fixed that for me.
If not, can you please share some screenshots of the issue, export the block field group to a JSON file or code to register the block and share it here? I will try to import and reproduce the issue on my site to check the issue.
Following the documentation https://docs.metabox.io/extensions/meta-box-builder/#export--import
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