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Problems (frontend and backend) after upgrade from CE 2.4.1 to 2.4.2

Problems (frontend and backend) after upgrade from CE 2.4.1 to 2.4.2

After upgrading from Magento CE 2.4.1 to 2.4.2, I am noticing a couple of show-stopper problems.


My env is as follows:

Debian 10

php 7.4

elasticsearch 7.11.0

mysql Ver 15.1 Distrib 10.3.27-MariaDB


no varnish or redis

Disabled modules: Magento_Amqp and Magento_WebapiAsync


This is working fine with Magento CE 2.4.1.


I followed the instructions to upgrade to Magento CE 2.4.2.  Cleared caches, verified file perms, etc, multiple times.


After the upgrade, here are the problems I've noticed:

1. Backend: the Design Configuration page never completely loads - I'm left with the spinning loader of death.


2. Backend: the Invoice page for a Sales Order never completely loads - also have the neverending spinning loader of death.



3. Frontend: for a Configurable Product, selecting one of the configurations - by the IN STOCK there is also "Only 0 left".

  • The stock count is incorrect, there are plenty in stock, and
  • I have Stores->Configuration->Inventory->Only X left Threshold set to "Use system value"

  So is this a new feature that is not working correctly?



Anyone else encountered these issues?