1.16 badlands inaccuracy
Cubiomes shows the layout of badlands changing in 1.16. However, this actually did not happen until 1.16.2 Pre-release 2. To test, create a world with the seed "pollinating sandboxes" and enter the command "/execute in minecraft:overworld run tp @s -1044.74 113.07 -1969.41 344.10 34.35". Before 1.16.2, you'll be teleported to a flat area. After 1.16.2, you'll be teleported to a plateau. This change is reflected in Cubiomes but is incorrectly made in 1.16 instead of 1.16.2.
Note that in Cubiomes, the version MC_1_X refers to the latest release of the respective major Minecraft version. That means that for 1.16, the version MC_1_16 refers to 1.16.5 (so MC_1_16 == MC_1_16_5). This was done because supporting all minor versions would be too much effort, and so support was limited to major versions. Cubitect has said that this convention will probably change because Mojang has now started making major changes in minor versions.