Errors on migration to Joomla 4

I cloned a J 3.10.4 site and migrated the clone to J 4.0.5

The "Check Community Builder Fields Database" tool shows the error "type is varchar(50) instead of text" for all of the social media userid columns. After backing up the site, I clicked the "fix" link and got another error message: "1170 BLOB/TEXT column 'fb_userid' used in key specification without a key length."

We're not using any of the social media options, so as far as I can tell it really doesn't matter to the functioning of the site. None of those fields are published, but the default is for them to appear on profile edit, and trying to change that also results in the 1170 error.

Should I have any concern about this?

Within _comprofiler database table delete all the table indexes, then run the database fix tools, that should clear that error up. In a future CB Connect release the storage of social ids will be moved to a separate database table and no longer be fields.