Wrong errors after second run with cache

[ilyaplot]

When I run psalm with cached results after editing any file I see UndefinedClass, UndefinedDocblockClass and other errors.
This bug reproduced in all my projects on Yii2 framework.

Psalm version is 4.20.0, yii2 framework, php 7.4.

Demonstration: https://www.loom.com/share/aea22198e3374afeaf57f175a9c877dd

My psalm.xml:

 <psalm
        errorLevel="5"
        resolveFromConfigFile="true"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns="https://getpsalm.org/schema/config"
        xsi:schemaLocation="https://getpsalm.org/schema/config vendor/vimeo/psalm/config.xsd"
>
    <projectFiles>
        <directory name="./"/>
        <ignoreFiles>
            <directory name="backend/runtime"/>
            <directory name="console/runtime"/>
            <directory name="console/migrations"/>
            <directory name="console/controllers"/>
            <directory name="vendor"/>
            <directory name="environments"/>
            <file name="requirements.php"/>
        </ignoreFiles>
    </projectFiles>
    <ignoreExceptions>
        <class name="yii\web\HttpException"/>
        <class name="yii\web\NotFoundHttpException"/>
        <class name="yii\web\BadRequestHttpException"/>
        <class name="yii\web\ForbiddenHttpException"/>
    </ignoreExceptions>
</psalm>

[psalm-github-bot]

Hey @ilyaplot, can you reproduce the issue on https://psalm.dev ?

[orklah]

could you try running with --no-diff ?

[ilyaplot]

@orklah if run with --no-diff then everything is ok, no errors.

[davidbyoung]

I'm also getting this issue on my project. --no-diff does seem to resolve the issue.

[christianlupus]

I have the same issue where --no-diff seems to help. I checked with 4.30 and 5.12. Both seem to be affected.