The interface is stuck when querying and receiving fields with mediumtext type

Reference picture: The field type of the blank column is mediumtext and the size is 170kb. This phenomenon occurs even when a row of records is queried

And you're using the latest release?

i got the same problem with the lastest version just installed

In the meantime this got a known issue. Another user found that v12.0 was the last version without that issue. See this thread.

The cause seems to be located somewhere in the Delphi libraries. v12.0 was compiled with Delphi 10.4, and following HeidiSQL versions are compiled with Delphi 11.0 and newer. This is basically what I found yet.