Publish a point feature class as a feature service to AGOL using ArcMap or Pro. Create 89 points with an attribute "Name" and populate the Name attribute as follows:
Add the feature service to ArcGIS pro via add data button.
Add a new locator using the feature service, and select the "Name" Field as the fields options, selecting "Contains" as the operator.
Execute a search using the locator, and "Camp" as the text string. Only 20 results are returned, despite the feature service containing 100 points with the text string "Camp".
Arcmap correctly returns the 89 features that contain the search string
This appears to be the case when using a FGDB or SDE feature class as the locator layer.