As soon as I go to edit mode (while the Select Panel tab is displayed in the N panel) I get these errors:
rna_uiItemO: operator missing srna 'mesh.adj_verices'
C:\Users\xan2622\AppData\Roaming\Blender Foundation\Blender\2.93\scripts\addons\select_panel.py:163
rna_uiItemO: operator missing srna 'mesh.adj_edges'
C:\Users\xan2622\AppData\Roaming\Blender Foundation\Blender\2.93\scripts\addons\select_panel.py:164
rna_uiItemO: operator missing srna 'mesh.adj_polygons'
C:\Users\xan2622\AppData\Roaming\Blender Foundation\Blender\2.93\scripts\addons\select_panel.py:165
rna_uiItemO: operator missing srna 'mesh.ext_deselect_boundary'
C:\Users\xan2622\AppData\Roaming\Blender Foundation\Blender\2.93\scripts\addons\select_panel.py:172
rna_uiItemO: operator missing srna 'mesh.pivot_set'
C:\Users\xan2622\AppData\Roaming\Blender Foundation\Blender\2.93\scripts\addons\select_panel.py:174
And if you hover the Select Panel buttons (in Edit Mode), these errors keep appearing in the Console.
Blender version: 2.93.5
Add-on version: 0.1.4