Error when converting project without any AdditionalDependencies

I have a project that was upgraded from Visual Studio 2010 to Visual Studio 2019. It is also being migrated from Qt 4.7.4 to Qt 5.13.

If I use "Convert custom build steps to Qt/MSBuild", I get a critical error popup, with only the message: "Object reference not set to an instance of an object.", and the title of that popup is "Microsoft Visual Studio".

It was working for some other projects, so I ended up finding out that if I set some additional dependencies in the linker options, just so that the .vcxproj file has the <AdditionalDependencies> line, it works. Simply adding ";" to the additional dependencies work.

It was already working fine for projects that had dependencies defined there.

Also, adding something like ";", then removing it also doesn't work. The vcxproj ends up with the following:

    <AdditionalDependencies>
    </AdditionalDependencies>

Which triggers a different error about an invalid character.

This project did not have additional dependencies because we were using #pragma comment(lib, ...) instructions to specify the libraries.

On a side note, some projects ended up with 2 different Qt versions defined in the <Globals> section of the vcxproj, like:

<Keyword>QtVS_v301</Keyword>
<Keyword>Qt4VSv1.0</Keyword>

I had to remove the Qt4 one manually when it happened. Not sure if this is in any way related to this issue, though.