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legend floats when position set via bbox_to_anchor

See original GitHub issue

Describe the issue

First noticed this on pan and zoom, but even on basic resize the legend moves all over the place when I set the location using

bbox_to_anchor=(1.45,1)

Here you can see the repositioning:

https://user-images.githubusercontent.com/1300499/121652954-30dbfe00-ca6a-11eb-98c3-35fc6c3a5063.mp4

where in the static version, the legend is firmly to the side:

Versions

I took the screencast with mpl 3.3.4, but am also observing it with 3.4.2

3.8.10 (default, May 19 2021, 13:12:57) [MSC v.1916 64 bit (AMD64)] ipympl version: 0.7.0 jupyter core : 4.7.1 jupyter-notebook : 6.4.0 qtconsole : 5.0.3 ipython : 7.22.0 ipykernel : 5.5.5 jupyter client : 6.1.12 jupyter lab : 3.0.16 nbconvert : 6.0.7 ipywidgets : 7.6.3 nbformat : 5.1.3 traitlets : 5.0.5 Config option kernel_spec_manager_class not recognized by ListNBExtensionsApp. Known nbextensions: config dir: C:\Users\story.jupyter\nbconfig notebook section jupyter-js-widgets/extension enabled - Validating: ok config dir: C:\Users\story\Anaconda3\envs\prop\etc\jupyter\nbconfig notebook section jupyter-matplotlib/extension enabled - Validating: ok jupyter-js-widgets/extension enabled - Validating: ok Config option kernel_spec_manager_class not recognized by ListLabExtensionsApp. [W 2021-06-11 04:11:00.742 LabApp] Config option kernel_spec_manager_class not recognized by LabApp. JupyterLab v3.0.16 C:\Users\story\Anaconda3\envs\prop\share\jupyter\labextensions jupyter-matplotlib v0.9.0 enabled ok @jupyter-widgets/jupyterlab-manager v3.0.0 enabled ok (python, jupyterlab_widgets)