Basically update this QoL mod to 1.20.4 (and beyond when available). Also, add a toggleable option to make placed concrete powder to hard to concrete if exposed to rain / snow.
I know there is some datapacks that achieve a similar thing (including vanilla tweaks), but my datapack list is already huge and difficult to maintain, so a mod is preferred.
https://modrinth.com/mod/cauldronconcrete
https://github.com/andantet/cauldronconcrete (Original version)
https://github.com/unilock/cauldronconcrete (more updated fork)