/teleport relative rotation fails to rotate pitch from -90° to 90°

Summary:

When attempting to rotate a player or entity from facing straight up to straight down using relative rotation with /teleport, the rotation does not occur.

This bug may cause existing datapacks to malfunction.

Steps to reproduce1:
Execute the following two commands in the chat box.

execute rotated 0 -90 run tp @s ~ ~ ~ ~ ~
execute rotated 0 90 run tp @s ~ ~ ~ ~ ~

Expected results1:
The player should face straight down.

Observed results1:
The player remains facing straight up.

Note: This issue does not affect the /rotate command.