This is a known issue when using gutenberg editor. As far as I know there is no fix yet from ACF and waiting on any kind of a solution from WP. There is another topic around here somewhere that has the link to the list
You can also check here https://www.advancedcustomfields.com/resources/known-issues/
And I found the other link as well https://github.com/WordPress/gutenberg/issues/12692
