The Bug

Target selector arguments x_rotation and y_rotation don't fully respect ranges if only one end of the range is given.

How To Reproduce

Look into the sky, your x_rotation is <0. Use this command:

/execute if entity @s[x_rotation=80..]

The feedback is Test passed, count:1, but your x_rotation (the last number on the `Facing` line on the F3 screen, it changes when you look up and down) is <0, not >=80.

This command only fails if your x_rotation is between 0 and 80.

This bug also exists for the y_rotation argument, but doesn't exist for other times ranges are used.

Workaround

Define both ends of the range.

/execute if entity @s[x_rotation=80..90]