It is similar to MCPE-170242.
Knockback occurs during invincibility time, and knockback in the air does not match the Java version.
BedrockEdition: https://youtu.be/yw9fF__jiPc
JavaEdition: https://youtu.be/Eb3wCnuhCAI

In the Java version, when knockback occurs in mid-air, it occurs downward, whereas in the integrated version, it occurs upward.
In the Java version, knockback occurs only when damage occurs, but in the integrated version, it appears to occur when the user strikes.