There was a recent post of a series that dives into CRDTs [1] . Someone linked to a paper, Chronofold: a data structure for versioned text [2] dated this April, that attempts to map CRDT semantics onto text editing. It's still on my list.

[1]: https://news.ycombinator.com/item?id=23737639

[2]: https://arxiv.org/pdf/2002.09511v4.pdf