PageBuilder jQuery issues

Developing on Kentico 13.0.47

I've created a page builder page that has a single drop-zone. I can add widgets to the page, and they render correctly. But now I'm trying to add a widget that has a 'page selector' property. The widget renders, but when I try to select a Page using the "configure widget" pane, next to the label (which is rendered correctly) I see the word "undefined". Here is my property:

[EditingComponent(PageSelector.IDENTIFIER, Label = "Selected Service Blocks", Order = 2)]
[EditingComponentProperty(nameof(PageSelectorProperties.RootPath), "/Reused-Content/Service-Blocks")]
[EditingComponentProperty(nameof(PageSelectorProperties.MaxPagesLimit), 6)]
public IEnumerable<PageSelectorItem> ServiceBlocks { get; set; } = Enumerable.Empty<PageSelectorItem>();

Text properties are working, but not Page Selector or Object Selector. One thing I notice, I see a few JavaScript errors on the page. I see 404 errors for the following:

https://localhost:44346/_content/Kentico.Content.Web.Rcl/Scripts/jquery-3.5.1 https://localhost:44346/_content/Kentico.Content.Web.Rcl/Scripts/jquery.unobtrusive-ajax.js.js https://localhost:44346/Kentico/Scripts/shim.min.js.map https://localhost:44346/PageBuilder/Public/Widgets/swiper-bundle.js.map

I believe these are the scripts loaded by using @Html.Kentico().PageBuilderScripts() in the view see I don't think I have control over the URL. Any ideas on why my selectors are not working?