PHP 8.1 Deprecated function: round(): Passing null to parameter #1 ($num) of type int|float is deprecated

Problem/Motivation

When applying the "Mask" or "Watermark" effect with PHP 8.1 the following warning message is displayed:

Mask error:

Deprecated function: round(): Passing null to parameter #1 ($num) of type int|float is deprecated in Drupal\system\Plugin\ImageToolkit\Operation\gd\Resize->validateArguments() (line 37 of core/modules/system/src/Plugin/ImageToolkit/Operation/gd/Resize.php).
Drupal\system\Plugin\ImageToolkit\Operation\gd\Resize->validateArguments(Array) (Line: 171)
Drupal\Core\ImageToolkit\ImageToolkitOperationBase->apply(Array) (Line: 124)
Drupal\Core\ImageToolkit\ImageToolkitBase->apply('resize', Array) (Line: 142)
Drupal\Core\Image\Image->apply('resize', Array) (Line: 33)
Drupal\image_effects\Plugin\ImageToolkit\Operation\gd\Mask->execute(Array) (Line: 172)
Drupal\Core\ImageToolkit\ImageToolkitOperationBase->apply(Array) (Line: 124)
Drupal\Core\ImageToolkit\ImageToolkitBase->apply('mask', Array) (Line: 142)
Drupal\Core\Image\Image->apply('mask', Array) (Line: 224)
Drupal\image_effects\Plugin\ImageEffect\MaskImageEffect->applyEffect(Object) (Line: 329)
Drupal\image\Entity\ImageStyle->createDerivative('core/modules/image/sample.png', 'public://styles/texto_destacado/public/core/modules/image/sample.png') (Line: 58)
template_preprocess_image_style_preview(Array, 'image_style_preview', Array)
...

Watermark error:

Deprecated function: round(): Passing null to parameter #1 ($num) of type int|float is deprecated in Drupal\system\Plugin\ImageToolkit\Operation\gd\Resize->validateArguments() (line 37 of core/modules/system/src/Plugin/ImageToolkit/Operation/gd/Resize.php).
Drupal\system\Plugin\ImageToolkit\Operation\gd\Resize->validateArguments(Array) (Line: 171)
Drupal\Core\ImageToolkit\ImageToolkitOperationBase->apply(Array) (Line: 124)
Drupal\Core\ImageToolkit\ImageToolkitBase->apply('resize', Array) (Line: 142)
Drupal\Core\Image\Image->apply('resize', Array) (Line: 32)
Drupal\image_effects\Plugin\ImageToolkit\Operation\gd\Watermark->execute(Array) (Line: 172)
Drupal\Core\ImageToolkit\ImageToolkitOperationBase->apply(Array) (Line: 124)
Drupal\Core\ImageToolkit\ImageToolkitBase->apply('watermark', Array) (Line: 142)
Drupal\Core\Image\Image->apply('watermark', Array) (Line: 237)
Drupal\image_effects\Plugin\ImageEffect\WatermarkImageEffect->applyEffect(Object) (Line: 329)
Drupal\image\Entity\ImageStyle->createDerivative('core/modules/image/sample.png', 'public://styles/texto_destacado/public/core/modules/image/sample.png') (Line: 58)
template_preprocess_image_style_preview(Array, 'image_style_preview', Array)
...

Steps to reproduce

Add a "Mask" or "Watermark" effect to an image style.

Proposed resolution

Looking for suggestions on the best way to solve this problem.

Remaining tasks

None.

User interface changes

None.

API changes

None.

Data model changes

None.