Custom block doesn’t display and disappear from my post

Hi,

I created a custom block that has 4 HTML boxes to end all my posts with to save me having to make changes one by one for my posts if I want to change to this end of post content.

However, I have two posts, so far, that the custom block keeps disappearing for no reason. No matter how many times I add the custom block and save the post or schedule the post, it doesn’t display and the block will have disappeared from the post when you go back to edit it.

How do I fix this issue?

I think both these posts I had tried a different custom block on beforehand, but subsequently deleted that block to go back to the customer block I’m trying to use now. Interestingly, when I tried copying all the information from the posts where this problem exists into a new post and add the custom block, the block disappears like the original post.

However, if I create a new post with new content and add the custom block, the block stays.

For the ones the custom box will disappear from, this code appears in the classic block when reviewed in HTML: <p><!– wp:block {“ref”:10096} /–></p>