After installing CraftTweaker 14.0.23, all datapacks (including the data driving vanilla Minecraft and mods) will refuse to load. Note that this bug does not happen with older versions of CraftTweaker.

seems to have been fixed in 7.0.2 (with crafttweaker now on version 14.0.27)

Awesome, thanks for the report and great that recent release also fix that issue