Did not like v3 when it was released at all so reverted to v2 pretty much straight away.
Latest release - v2.48.2029 (2029) works just fine on Sonoma.
Seriously, the only thing that it is missing is an option to limit size of the file names when they are encrypted, to avoid sync issues with Nextcloud. Keeping file path to minimum, but still sometimes have this issue.
Support of FUSE-T would basically allow Boxcryptor v2 to work on macOS for years to come without issues.
Still hope that some of the BoxCryptors core developers will create it's "fork" one day and continue the development of great BoxCryptor v2.