Gist code format problem after upgrading to 5.3 version

[johncod]

After upgrading to 5.3 version of WordPress all the gists in my website have a weird code format.

To reproduce it:
Go to Gutenberg editor and paste a gist url (ex. ​https://gist.github.com/johncodeos/927c2caa0ead9ec8d2fc5c96729055fd#file-linkedinauthvc-swift) without permalink.
And the results in front-end is:

Do the same for 5.2.4 and the results are:

[Otto42]

WordPress does not have any embedding of gist's by default. If you're using a plugin to enable this, then you should leave a message on their support forums for the plugin.

Which plugin are you using?

[johncod]

Replying to Otto42:

WordPress does not have any embedding of gist's by default. If you're using a plugin to enable this, then you should leave a message on their support forums for the plugin.

Which plugin are you using?

I'm using GistPress but as I saw there ​https://en.support.wordpress.com/gist/ (I know, it's wordpress.com and not .org) and did the first method (the one you paste the link on the Gutenberg editor without permalink) it's working and have the same results as the GistPress plugin, that's why I posted as a Wordpress core bug.

[Otto42]

Replying to johncod:

I'm using GistPress but as I saw there ​https://en.support.wordpress.com/gist/ (I know, it's wordpress.com and not .org) and did the first method (the one you paste the link on the Gutenberg editor without permalink) it's working and have the same results as the GistPress plugin, that's why I posted as a WordPress core bug.

Are you using Jetpack? It has some of the same code that WordPress.com routinely runs, and many of those things are enabled by Jetpack.

[johncod]

Replying to Otto42:

Replying to johncod:

I'm using GistPress but as I saw there ​https://en.support.wordpress.com/gist/ (I know, it's wordpress.com and not .org) and did the first method (the one you paste the link on the Gutenberg editor without permalink) it's working and have the same results as the GistPress plugin, that's why I posted as a WordPress core bug.

Are you using Jetpack? It has some of the same code that WordPress.com routinely runs, and many of those things are enabled by Jetpack.

I just found that it's from the GistPress too, I disabled the plugin and the first method from wordpress.com it's not working. So the problem comes from the plugin.

Thanks!

[Otto42]

Cool. You should report the issue to them. It may simply be a styling issue.