How to fix the the mass-action dropdown's in-place input of the Amasty's «Extended Product Grid» module?

Administration Third-party extensions
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2

How to fix

Add the Magento_InventoryCatalogAdminUi module to the <sequence> section of the Amasty_Paction's module.xml file:

<module name="Amasty_Paction" setup_version="1.0.0">
	<sequence>
		<...>
		<module name='Magento_InventoryCatalogAdminUi'/>
	</sequence>
</module>

Then run bin/magento setup:upgrade and bin/magento setup:static-content:deploy.