Followed Channels Sidebar navigates to bottom of scroll region when mouse leaves the pane

[Squiggle-P]

Describe the bug
When the "For You" side-menu loads (Followed Channels, Recommended Channels, Other ABCDEF viewers also watch... etc), each of the subcategories are loaded compressed, with the option to "Show More" to expand. The total side-menu does not exceed the page height when it's initially loaded. However, when the "Show More" button is used to expand and view more channels in the "Followed Channels" category (bug behavior does NOT occur with only other submenus expanding), the height of this pane exceeds the height of the browser and the scroll bar appears. This all works as normal, so long as the mouse cursor is hovering over this pane. As soon as the mouse cursor LEAVES the pane, the scroll bar snaps to the bottom.

To Reproduce
Steps to reproduce the behavior:

1. Navigate to Twitch.TV homepage
2. Navigate to the For You pane
3. Expand the "Followed Channels" category with the "Show More"
4. Move mouse cursor back to main Twitch pane
5. "For You" pane snaps to bottom of scroll region, obscuring the channels that have now been pushed out of the top of the scroll region.

Expected behavior
At step 5 above, I would expect that no action will take place when the mouse cursor leaves the pane - the channel list should remain exactly as-is.

Screenshots
Can be provided if applicable.

Environment (please complete the following information):

• OS: Windows 10 Pro
• Browser: Google Chrome
• Version: v1220.6261.129
• Other Extensions: BTTV, uBlock Origin, TTV LOL

FFZ Logs (via FFZ Control Center > Home > Feedback >> Log):
The upload timed out, log text below.

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[20:35:22] info | core: Initial URL: https://www.twitch.tv/
[20:35:22] info | site: Using: Twilight
[20:35:22] info | site.web_munch: Found and wrapped webpack's loader after 0ms.
[20:35:22] info | settings: Using Provider: LocalStorageProvider
[20:35:22] info | site.web_munch: require() grabbed in 1.30000ms.
[20:35:22] info | core: Loaded descriptions of 0 modules.
[20:35:22] info | settings: Initialization complete after 35.80000ms -- Values: 28 -- Profiles: 2
[20:35:22] info | site.fine: Installing MutationObserver.
[20:35:22] info | site: Loaded descriptions of 17 modules.
[20:35:22] info | site.elemental: Installing MutationObserver.
[20:35:22] info | experiments: Loaded information on 4 experiments.
[20:35:22] info | core: Initialization complete in 221.80000ms.

settings
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experiments
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Unique ID: jikmcs1yzKWZhiGxPPNFOOqhnc2vmBTa

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Known
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Additional context
N/A