I can still not find any documentation or at least the release notes for L5.4.24_2.1.0. How about any further future releases? Any public roadmap available anywhere? Thanks!
L5.4.24 is beta release, therefore there is no usual documentation for it.
Use L5.4.3 documentation. It may help.
OK, but despite L5.4.3_2.0.0 also just being a beta such documentation does exist there:
Any news about a roadmap concerning GA releases with documentation?