Wordpress (TinyMCE) eats up paragraph tags if you leave the post, then go back to it

[archon810]

On two of my sites (at least using Chrome stable), I've been noticing random loss of paragraphs where text separated by just new p tags gets merged into a single paragraph. If the separators are images, the paragraphs don't get joined, so it's only for text as simple as

<p>a</p>
<p>b</p>

This makes entire posts unreadable due to them becoming a wall of text.

To reproduce:

• load any post with multiple consecutive paragraphs.
• leave the page by going to another site, for example press View post.
• press Back in your browser and observe the paragraphs merged after TinyMCE loads. Sometimes you may need to leave the page twice, but for the most part, once is enough, in my testing.

I've tried on two different sites, one that disables autop and one that doesn't, and both are affected.

This is a pretty serious issue because it's destructive, so I'm inclined to give it a high priority, if I could.

I'm going to attach several images comparing before and after.

[archon810]

Original text

[archon810]

After leaving the page and coming back to it, paragraphs merged

[azaozz]

Duplicate of #28037.

Unfortunately Chrome doesn't care about autocomplete="off". It keeps "auto-filling" the editor textarea regardless... Only solution known to work for now is to set autocomplete="off" on the whole form.