CONNECT and ALTER TABLE: real behavior != documentation

In this page:

https://mariadb.com/kb/en/mariadb/documentation/storage-engines/connect/connect-table-types/inward-and-outward-tables/

I read:

"Translating a CONNECT table to another engine is fine but the opposite is forbidden when the target CONNECT table is not table based or when its data file exists"

I tried ALTER TABLE ... ENGINE = ? in both directions (from and to CONNECT) with both file-based inward/outward tables. It always works: no errors, data is not damaged.

Maybe the documentation is not updated?