The Function field needs to be updated.

When updating the votingapi module to version 8.x-3.0-beta1. I had the problem of not being able to update the vote_result entity.

I used the command "drush entup" but got the error "The SQL storage cannot change the schema for an existing field (function in vote_result entity) with data."

And the way below has helped me solve that problem. Hope it can be helpful.

Note: Back up your database first.
Step 1: Export the votingapi_result table and the votingapi_vote tables into the corresponding sql files. I use the command line "mysqldump -uSqluser -p mysitedb votingapi_vote > votingapi_vote.sql" and "mysqldump -uSqluser -p mysitedb votingapi_result > votingapi_result.sql".
Step 2: Export all configurations. Here I use the command line: "drush cex".
Step 3: Uninstall votingapi module, in this step, rate module will also be required to uninstall.
Step 4: Import the exported configuration in step 2. I use the command line: "drush cim".
Step 5: Import the votingapi_result data table and the votingapi_vote data table exported in step 1. Note that you need to edit the xxx.sql file and delete the table creation for "Table structure for table `xxx`"
because this table already exists, we only need to keep "Dumping data for table `xxx`" because these are the data that needs to be re-imported. I use the command line: "drush sql:cli < votingapi_vote.sql" and "drush sql:cli < votingapi_result.sql".
Step 6: Clear the cache and see the results.