Bug: Material Modify Control Animated goes back a frame after finishing animation lerp

[Konclan]

Describe the bug

Once it reaches the last frame it immediately goes back 1 frame

https://github.com/StrataSource/Portal-2-Community-Edition/assets/16567080/4db73602-99df-4437-8e0c-c2033e486201

Issue Map

NA

To Reproduce

Make a material with a MaterialModifyAnimated and use a material_modify_control entity with the input "startanimsequence"

Operating System

No response