Error that occurs in version 8.0, does not occur in 7.1

I've upgraded to PHPRunner 8.0 build 23092 (64bits). Inside the software, I'm getting this error:

Error executing query

MySQL server has gone away

I've tried a database in another hosting and the problem persists.

So, I've installed PHPRunner 8.0 build 23092, but now: 32bits

And the problem persists.

If I use PHPRunner 7.1 this problem does not occur.

Is this a bug?

What should I do to use PHPRunner 8.0?