The right half of 作 was corrupted to look like unrelated 古.

Change in form

Due to historical stylistic changes, this component is less similar to 作 than it was in ancient scripts.

夂 is a component form of 攴.

氵 is a component form of 水.

Later reanalyzed as the visually similar character 舌.

Change in form

Due to historical stylistic changes, this component is less similar to 𠯑 than it was in ancient scripts.