Page Builder error on CE 2.4.3p1

Question

We recently upgraded from CE 2.4.2 to 2.4.3p1 and we face a major issue with Page Builder. We are no longer capable of saving product, pages, blocks, ... due to Page Builder.

On save, if we have modified any Page Builder content, there are no communication with the server, but a lock with an infinite spinning icon.

We receive [ERROR] Page Builder was rendering for 5 seconds without releasing locks. in the browser console. We have tested same issue with Chrome & Firefox.

Any clue of how to solve this issue or where to investigate to find some code/settings triggering this ?

Thanks Yannick

Answer 1

Seems as if you are experiencing a very slow admin. I had some issues myself and applied the following command:

bin/magento config:set system/security/max_session_size_admin 512000

Found this solution on: Upgrade to magento 2.4.3 - Backend is very slow

Answer 2

This error can happen when you have either custom content-types or overwritten the master.html master_template. If you are missing attr="data.main.attributes" in the the template it will not render and produce this error.

In my case I've had the following master.html:

<div class="relative">
    ...

But adding attr="data.main.attributes" to my root element fixed the issue and the page saved again:

<div class="relative" attr="data.main.attributes">
    ...

In general this error seems to happen if the pagebuilder is unable to render the final result for some reason.