I can’t duplicate your issue. You need to use this slider, which it seems you have at least sometimes. I can’t cause it to disappear as you seem to have.
Version 126.0.6478.127 (Official Build) (64-bit)
It’s been happening before this version too
For me it remains at the top, and never moves if I scroll away from it, even if I use it to scroll
Huh. The plot thickens, I suppose. Sticky positioning should work on Chrome versions 56 and up. I haven’t been able to reproduce the issue on my end either, so consider me stumped 
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Darn, well I guess if it’s only me then it’s not really a big deal, just thought it would help everyone overall if it was just not properly implemented