Rating: 3 stars

Principle: This plugin consists of two parts:
1) Automatic anchor creation for H2 and H3 when saving a page.
a) “My Headline” gets anchor #my-headline.
b) You can still manually change it to #my-head-line.
c) Warning: Not Gutenberg compatible!
2) Linker. When using “Insert Link” in the editor the search dialog does not only match in the page titles/slugs but also in anchor-names. And creates a /page-slug#anchor-name link for you.
a) Most likely also not Gutenberg compatible.

Read the plugin description and plugin support for updates, maybe the developer will add Gutenberg compatibility or maybe at least on one of the two sides for starters.

Rating: 5 stars

Very easy to use. Automatically sets IDs to H2 and H3. When adding links to anchors they appear when you start to type them! 5/5

Rating: 5 stars

The plugin nserts #id into h2/h3 on save, and make the headings available via core link search UI. Clever!

Rating: 1 star

Installed and broke my website…

Rating: 5 stars

Thanks! Just what I needed, and this one does work.