HoverTool not disappearing in notebooks

I’m using Bokeh v3.3.1 in a Jupyter Lab v4.0.8 notebook environment, and doing a typical HoverTool thing:

fig.add_tools(bokeh.models.HoverTool(                          
  tooltips=[(str(col), hover, )],                           
  formatters={ ... },
  renderers=[line_el],
  mode='vline',                                                                                                        
))

Under this setup the hover tooltips themselves do not “disappear” as you would expect, when the browser is scrolled vertically. Moving the mouse cursor off the chart seems to work as usual.

This happens in both Firefox v121.0.1 and Brave v1.61.116, but much more frequently in Brave.

Any suggestions?