Entering zoom tube and disabling alwaysmlook in the same time hacks the mouse

[Panda.]

Before you enter the Zoom Tube, change your aim to up or down and enter there then change you alwaysmlook to off. Once you got out and gravity changed and you will see your previous aim stuck and can't aim up or down anymore until you enable your alwaysmlook

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And I made sure that getting out from the Zoom Tube and gravity changed in the same time is what do this glitch. and that wasn't happen when the 2.1.21 version get released.