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

A working input control


A broken input control


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">
		<module name='Magento_InventoryCatalogAdminUi'/>

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