Fix regression on Bounds stream #1350

Job	Run time
Run pre-commit hooks	18s
UI tests on ubuntu-latest with Python 3.9	2m 39s
Pytest on 3.8, Bokeh 2, ubuntu-latest	29m 56s
Pytest on 3.8, Bokeh 3, ubuntu-latest	31m 14s
Pytest on 3.11, Bokeh 2, ubuntu-latest	28m 25s
Pytest on 3.11, Bokeh 3, ubuntu-latest	34m 30s
Pytest on 3.8, Bokeh 2, macos-latest	40m 35s
Pytest on 3.8, Bokeh 3, macos-latest	41m 13s
Pytest on 3.11, Bokeh 2, macos-latest	57m 50s
Pytest on 3.11, Bokeh 3, macos-latest	46m 52s
Pytest on 3.8, Bokeh 2, windows-latest	46m 53s
Pytest on 3.8, Bokeh 3, windows-latest	49m 6s
Pytest on 3.11, Bokeh 2, windows-latest	52m 57s
Pytest on 3.11, Bokeh 3, windows-latest	1h 0m 51s
	8h 43m 19s

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