I've been quite active, making numerous adjustments and experimenting with various tabs in an attempt to reproduce the problem. However, despite my efforts, I have been unable to replicate the issue.
Addressing the problem will prove challenging without a reliable method of reproducing it, and I hope you can understand this.
As a potential workaround for pages encountering this particular issue, you can consider utilizing revisions.
Could you please create a video recording where you modify the content in your typical manner and verify whether the problem persists?
I again tried to replicate the issue and here is the video that I performed, can you check and see if it's the same thing you are trying to do? hidden link
If yes, this is quite random, so I would suggest you to use a different browser and see if it helps.
If it was happening to logs, it will be happening everytime, so I don't think it's the reason the issue is happening.
Since the issue is quite random and we are unable to replicate it, I suggest you edit the default page with a visual editor and use WPML editors for the secondary languages, this should eliminate the random issue.
