Does the minor number of Qt version matter at dynamic linking plugin?

[IngInx747]

Hello, I am met with an issue of meshlab loading a filter plugin I created (IO plugin is not tested yet).

I have both binaries downloaded

and built from the source and Qt 5.15.9.

The plugin works well in the meshlab I built from the source (of course it does). But when it comes to the downloaded one, the plugin does nothing, even it appears to be loaded successfully.

The differences of two releases are attached. I wonder if it is a must that Qt minor digits match for plugin to work properly.

[alemuntoni]

As QPluginLoader documentation says:

QPluginLoader checks that a plugin is linked against the same version of Qt as the application.

Therefore, it seems that the Qt version must be the same.

[IngInx747]

I created an IO plugin built with Qt 5.15.9 and it works well in the released version(Qt 5.15.2). Why IO works but filter does not?